When people do a good deed, particularly when they do it on a whim or by chance, they will come to see the beneficiary of their generosity in a warmer light. Their cognition that they went out of their way to do a favor for this person is dissonant with any negative feelings they might have had about him. In effect, after doing the favor, they ask themselves: “Why would I do something nice for a jerk? Therefore, he’s not as big a jerk as I thought he was—as a matter of fact, he is a pretty decent guy who deserves a break.”
