The issue of whether “pure evil” exists, however, is separate from what happens to our judgments and our behavior when we believe in its existence. It is this question to which several researchers have recently begun to turn. How can we measure people’s belief in pure evil (BPE) and what consequences does such a belief have on our responses to wrong-doers?

According to this research, one of the central features of BPE is evil’s perceived immutability. Evil people are born evil – they cannot change. Two judgments follow from this perspective: 1) evil people cannot be rehabilitated, and 2) the eradication of evil requires only the eradication of all the evil people. Following this logic, the researchers tested the hypothesis that there would be a relationship between BPE and the desire to aggress towards and punish wrong-doers.

Researchers have found support for this hypothesis across several papers containing multiple studies, and employing diverse methodologies. BPE predicts such effects as: harsher punishments for crimes (e.g. murder, assault, theft), stronger reported support for the death penalty, and decreased support for criminal rehabilitation. Follow-up studies corroborate these findings, showing that BPE also predicts the degree to which participants perceive the world to be dangerous and vile, the perceived need for preemptive military aggression to solve conflicts, and reported support for torture.