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Most of us spend good money avoiding arguments. We pay for noise canceling headphones. We curate social media feeds that reflect our views back at us like a warm mirror. We choose friends who nod along when we talk. And when someone disagrees with us, our first instinct is not curiosity. It is irritation.
John Stuart Mill thought this was a terrible way to live. Worse, he thought it was a terrible way to think. In his 1859 work On Liberty, Mill made a case so simple it is almost embarrassing that we still need to hear it: if you are not regularly exposed to people who think you are wrong, you do not actually understand why you are right. You just happen to hold a position. You are a parrot with a diploma.
Mill went further. He suggested that if no genuine dissenters exist, we should invent them. We should, in effect, hire people to tell us we are mistaken. Pay them. Give them a stage. Thank them for the trouble. This idea sounds absurd until you think about it for more than thirty seconds. Then it starts to sound like the most rational investment a person, a company, or a society could make.
The Strange Economics of Disagreement
Think about what you spend money on in a given year. Some of it goes to things that make you comfortable. Some goes to things that make you smarter. Very little goes to things that make you less certain about what you already believe.
This is a budgeting problem, and Mill would argue it is the most expensive one you have. Not because uncertainty is pleasant, but because false certainty is catastrophic. History is a graveyard of confident people. Generals who were sure about the terrain. CEOs who were sure about the market. Politicians who were sure about the public mood. The cost of their certainty was not paid by them. It was paid by everyone around them.
Mill understood something about knowledge that most people still resist: holding a true belief without understanding the objections to it is barely different from holding a false belief. In both cases, you cannot defend your position under pressure. In both cases, you will abandon it the moment a more charismatic speaker comes along with a different story. Your belief is not a conviction. It is a habit.
So what would it look like to take Mill seriously? What if we actually paid people to argue with us?
The Devil’s Advocate Was a Real Job
Here is something most people do not know. The concept of a devil’s advocate was not originally a figure of speech. It was an actual job title in the Catholic Church. When the Vatican considered someone for sainthood, they appointed a person called the Promotor Fidei, the Promoter of the Faith, whose sole job was to argue against the candidate. This person had to dig up every unflattering fact, every questionable miracle, every reason the proposed saint might not deserve the title.
The Church understood something that most modern institutions have forgotten: important decisions need structured opposition. Not the polite kind where someone raises a hand and says “just playing devil’s advocate here” before offering a criticism so mild it evaporates on contact. Real opposition. The kind that makes the room uncomfortable.
Pope John Paul II effectively eliminated this role in 1983.
The lesson is not about saints. It is about what happens when you remove the person whose job it is to say no. Decisions get faster. They also get worse.
Why Free Disagreement Is Not Enough
You might argue that we do not need to pay for disagreement. After all, the internet is an all you can eat buffet of people who think you are an idiot. Twitter alone could supply enough conflict to last several lifetimes. Why would anyone pay for what is already free?
Mill would have had a sharp answer to this. The disagreement that floods our lives is mostly useless. It is tribal, performative, and shallow. People online are not trying to refine your thinking. They are trying to win. They are performing for their own audience. The goal is not to show you where your reasoning breaks down. The goal is to show their followers that they are clever and you are not.
This is the difference between a sparring partner and someone who jumps you in a parking lot. Both involve getting hit. Only one makes you a better fighter.
Paid disagreement, the kind Mill imagined, has a structure to it. The person arguing against you is not doing it out of ego or tribal loyalty. They are doing it because they have been given a specific mandate: find the weaknesses in this idea. Stress test it. Push until it breaks or proves it can hold weight. This is not hostility. It is a service. And like most valuable services, it is worth paying for.
The Biology of Being Wrong
There is a reason we avoid disagreement, and it is not just laziness. Neuroscience has shown that when our beliefs are challenged, the brain responds in much the same way it does to a physical threat. The amygdala fires up. Stress hormones flood the system. Your body is preparing you to fight or flee, not to update your spreadsheet of opinions.
This means that seeking out disagreement is not just intellectually difficult. It is biologically uncomfortable. Your own nervous system is working against you. It does not want you to consider the possibility that you are wrong. It wants you to win the argument, or failing that, to leave the room.
Mill did not have access to brain scans, but he intuited this problem clearly. He knew that the natural human tendency is to surround yourself with agreement. He also knew that this tendency, left unchecked, leads to intellectual decay. Your beliefs become like muscles you never exercise. They look fine from the outside, but they cannot do any real work.
Paying someone to argue with you is a way of overriding your biology. It creates an external structure that forces you to engage with opposing views even when every cell in your body is telling you to stop listening. It is, in a sense, a gym membership for your mind. And just like a gym membership, the value comes precisely from the discomfort.
What Corporations Get Wrong
The business world talks constantly about innovation and disruption. Companies spend fortunes on consultants, offsites, and brainstorming sessions. They plaster their walls with slogans about thinking differently. And then they systematically punish anyone who actually does.
This is not a new observation, but it is worth connecting to Mill’s framework. Most organizations are structurally hostile to dissent. The person who challenges the boss’s strategy in a meeting does not get a bonus. They get a reputation. The word used is usually “difficult.” In some cultures, it is less polite than that.
The result is predictable. Everyone in the room agrees with the plan. The plan moves forward. When it fails, everyone is surprised. But no one should be, because the failure was baked in the moment dissent became a career risk.
A few companies have tried to formalize disagreement. Amazon’s practice of writing six page memos before meetings is partly designed to surface objections before groupthink takes hold. Ray Dalio built his hedge fund Bridgewater around the principle of “radical transparency,” where employees are expected to challenge each other openly, regardless of rank. The results have been polarizing. Some people thrive in this environment. Others describe it as a psychological pressure cooker.
But the underlying insight is Mill’s. If you want good decisions, you need structured opposition. And if opposition will not arise naturally, which it usually will not, you need to create the conditions for it. Sometimes that means paying for it.
The Paradox of Tolerance for Bad Ideas
Here is where Mill’s argument gets genuinely uncomfortable. He did not just say we should tolerate dissent about small things, like where to go for dinner or which software tool to adopt. He argued that even dangerous, repugnant ideas should be heard. Not because they might be right, though he acknowledged that sometimes they are. But because suppressing them makes the ideas we hold in opposition weaker.
This is a hard pill to swallow. It means that banning a terrible argument does not make it go away. It just means that the people who oppose it lose the ability to explain why it is terrible. They forget the reasons. They rely on social pressure instead of logic. And when social pressure shifts, as it always eventually does, they have nothing left.
Mill’s position is not that all ideas are equally valid. That would be absurd. His position is that the process of engaging with wrong ideas is what keeps right ideas alive and functional. It is the difference between a vaccine and a bubble. The vaccine exposes you to a controlled version of the threat so your immune system can learn. The bubble just delays the inevitable.
This has obvious implications for how we handle speech on university campuses, in media, and online. But it also has deeply personal implications. If you have never seriously engaged with the strongest version of an argument you disagree with, Mill would say your disagreement is not worth much. You are not refuting the idea. You are refusing to look at it.
Bringing It Into Your Own Life
This does not require hiring a professional contrarian, though that would be entertaining. It can start with much simpler changes.
Find the smartest person who disagrees with you on something important. Buy them lunch. Ask them to make their case. Do not interrupt. Do not prepare your rebuttal while they are talking. Just listen. If their argument has no effect on you whatsoever, one of two things is true: either their argument is genuinely weak, or you were not actually listening.
When you read the news, occasionally read something from a source you find frustrating. Not the cartoonish version of the other side, the one designed to make you feel superior. The serious version. The one written by someone who is clearly intelligent and clearly disagrees with you. Sit with the discomfort.
In your professional life, before making a big decision, ask someone to argue against it. Give them explicit permission. Better yet, give them an incentive. Tell them that if they can find a fatal flaw in the plan, you will take them to dinner. You are not undermining your leadership by doing this. You are strengthening it. The leader who invites challenge is not weak. The leader who cannot tolerate challenge is.
The Cost of Agreement
Mill lived in Victorian England, a society that was, on paper, more intellectually open than most of its predecessors. It had a free press. It had parliamentary debate. It had a tradition of public intellectualism. And yet Mill looked around and saw conformity everywhere. He saw people clinging to received opinions not because they had examined them, but because examining them was socially inconvenient.
Not much has changed. We have more information than any humans in history. We have access to every perspective ever recorded. And we use this extraordinary machinery primarily to confirm what we already thought before we opened our browsers.
The cost of this is not immediately visible. It is not like a stock market crash or a building collapse. It is slow and quiet. It is the gradual hollowing out of your ability to think under pressure. It is the slow replacement of understanding with certainty. And certainty, as Mill knew, is the most dangerous luxury a mind can afford.
We do not need to agree with Mill on everything to take his central point seriously. The people who challenge us are not obstacles to clear thinking. They are the condition for it. And if we have to pay them, bribe them, or drag them into the room, that is a small price for the service they provide.
After all, the most expensive thing in the world is not a good argument. It is a bad decision that nobody questioned.
