Human Beings Are Much More Tribal Than Rational

We assume we hold our beliefs because we have reasoned our way to them. The evidence suggests we do something far more primitive and far more interesting.

We like to think of ourselves as rational beings who arrive at beliefs by weighing evidence. That is a comforting story. And like most comforting stories, it is largely false.

In practice, human beings are far more tribal than rational. We do not simply ask, What is true? We ask, usually without admitting it, Who is saying this? Whose side is this on? Will agreeing with this strengthen or weaken my standing? Belief is often less a matter of reason than of belonging.

This is one of the most important, and least flattering, facts about human nature. It explains why brilliant people hold absurd positions, why evidence so rarely changes minds, and why public discourse has the texture of tribal warfare rather than collective inquiry.

Are we just one of the crowd?

Rationality is a post-hoc performance

The psychologist, Jonathan Haidt, famously described moral reasoning as 'the tail wagged by the dog': we have emotional, intuitive reactions first, and recruit reasons afterward. The same architecture governs political and ideological belief. We do not begin with detached reasoning and end with conviction. We begin with instinct, group alignment, or social fear, and then construct reasons to justify the position we were already going to hold.

This is not always conscious dishonesty. Often it is a sincere performance of open-mindedness that conceals a commitment that was never really up for review. Rationality, in these cases, functions not as a truth-seeking instrument but as a press release, polished, persuasive, and pointing in a direction already decided.

The participants in most debates are not trying to discover the truth. They are managing their status. Truth, where inconvenient, is quietly set aside.

This is why debates so rarely move anyone. The participants are not genuinely interrogating their positions. They are defending a perimeter. Victory means not yielding; defeat means not just losing an argument but losing face, signalling weakness, perhaps even losing your place in the group. Under those stakes, rationality was never really the game.

The mind as border guard

That is why people can be impressively intelligent in one context and embarrassingly irrational in another. Their reasoning capacities have not disappeared. They have been repurposed. Once an idea is coded as ours or theirs, the mind shifts from truth-seeking to identity-protection. It begins scanning, not for accuracy, but for threat.

The same person who demands rigorous evidence from one side will wave through unexamined claims from the other not because they are stupid, but because their intelligence has been deployed in service of allegiance. We are, all of us, capable of this. It is not a feature of lesser minds. It is a feature of minds that evolved inside groups where social exclusion could be fatal.

We are not, in other words, primarily persuaded by arguments. We are persuaded by identity reinforcement.

Why tribe feels safer than truth

Truth is cold. Tribe is warm. That asymmetry matters.

If you belong, if you absorb the group's assumptions, defend its sacred narratives, and perform loyalty when it is demanded, you receive warmth, protection, and a stable sense of who you are. These are not trivial rewards. For most of human evolutionary history, they were survival advantages. The mind that treats social exile as an existential threat is not irrational; it is responding to deep, accurate memory.

The price of belonging is epistemic: you cannot follow the evidence wherever it leads because some destinations put your membership at risk. This is why disagreement so often feels visceral rather than intellectual. To question the tribe's core beliefs is not merely to question an idea. It is to threaten the self that the group has helped construct.

People will reinterpret facts, soften conclusions, and contort principles long before they risk being cast out.

What looks like stubbornness or bad faith is often something more structural: the cognitive cost of genuine independence is simply higher than most people are willing, or able, to pay.

When morality becomes a mask for tribalism

The most seductive form of tribal thinking is the kind that believes it is not tribal at all. When a group's preferences harden into principles, when its prejudices acquire the grammar of ethics, you have arrived at what might be called moral tribalism, or the sincere conviction that defending the group is the same as defending what is right.

This is how intelligent people become predictable. And how whole institutions become incapable of self-correction. Not through malice, but through the slow, invisible process by which allegiance colonises conscience until the two feel indistinguishable.

Academia is not immune. Neither is activism, journalism, business, or religion. In each domain, you can observe the same pattern: group norms calcify, dissent is penalised, and the result is a community that is morally energised but epistemically closed.

The harder path

Genuine rationality is not a cognitive upgrade. It is a social sacrifice. It asks us to remain loyal not to our side but to reality, which means being willing to say things our group does not want to hear, follow evidence to conclusions our group finds threatening, and accept the possibility that we have inherited our beliefs rather than earned them.

That requires sentences most people rarely speak:

• My side got this wrong.

• I do not like where the evidence leads.

• I may have been tribal where I thought I was being principled.

• Being right matters more than being approved of.

  
  

None of those are comfortable. But discomfort is, in this case, evidence of progress. If thinking clearly about something costs you nothing socially, you are probably operating safely within your tribe's approved conclusions.

If we want to be more rational, we have to begin by admitting how tribal we actually are. And that admission is uncomfortable precisely because it is true and because the tribe does not particularly want to hear it.

Kathy Postelle Rixon is a Cambridge researcher, Shamanic practitioner, and Chair of The Philosophical Society: Oxford. You may reach her at kathy@magicinharmony.com.