But disincentive is not enough: the fool is a real thing. Some people do not know their own interest—just consider addicts, workaholics, people trapped in a bad relationship, people who support large government, the press, book reviewers, or respectable bureaucrats, all of whom for some mysterious reason act against their own interest. So there is this other instance where filtering plays a role: fools of randomness are purged by reality so they stop harming others. Recall that it is at the foundation of evolution that systems get smart by elimination.
