We should not expect individuals to produce good, open-minded, truth-seeking reasoning, particularly when self-interest or reputational concerns are … - Jonathan Haidt

Does helping others really confer happiness or prosperity on the helper? I know of no evidence showing that altruists gain money from their altruism, but the evidence suggests that they often gain happiness. People who do volunteer work are happier and healthier than those who don’t; but, as always, we have to contend with the problem of reverse correlation: Congenitally happy people are just plain nicer to begin with,24 so their volunteer work may be a consequence of their happiness, not a cause. The happiness-as-cause hypothesis received direct support when the psychologist Alice Isen25 went around Philadelphia leaving dimes in pay phones. The people who used those phones and found the dimes were then more likely to help a person who dropped a stack of papers (carefully timed to coincide with the phone caller’s exit), compared with people who used phones that had empty coin-return slots. Isen has done more random acts of kindness than any other psychologist: She has distributed cookies, bags of candy, and packs of stationery; she has manipulated the outcome of video games (to let people win); and she has shown people happy pictures, always with the same finding: Happy people are kinder and more helpful than those in the control group.

So, we’ve reached the state that George Will described. He said there’s a certain kind of liberal that wants diversity in everything, except thought. And so, we do need certain kinds of diversity. But the key to remember is that, diversity by its very nature is divisive, and so, what’s the function of your group? If your group needs cohesion, you don’t want diversity. If your group needs good, clear thinking and you want people to challenge your prejudices, then you need it. So in the academic world, we need that kind of diversity, and we don’t have it.

An important dictum of cultural psychology is that each culture develops expertise in some aspects of human existence, but no culture can be expert in all aspects. The same goes for the two ends of the political spectrum. My research3 confirms the common perception that liberals are experts in thinking about issues of victimization, equality, autonomy, and the rights of individuals, particularly those of minorities and nonconformists. Conservatives, on the other hand, are experts in thinking about loyalty to the group, respect for authority and tradition, and sacredness.4 When one side overwhelms the other, the results are likely to be ugly. A society without liberals would be harsh and oppressive to many individuals. A society without conservatives would lose many of the social structures and constraints that Durkheim showed are so valuable. Anomie would increase along with freedom. A good place to look for wisdom, therefore, is where you least expect to find it: in the minds of your opponents. You already know the ideas common on your own side. If you can take off the blinders of the myth of pure evil, you might see some good ideas for the first time.