Research shows that people are more likely to make a charitable gift to a single needy individual than to an entire impoverished region. We are wired to feel things for people, not for abstractions. Sometimes the hard part is finding the right emotion to harness. For instance, it’s difficult to get teenagers to quit smoking by instilling in them a fear of the consequences, but it’s easier to get them to quit by tapping into their resentment of the duplicity of Big Tobacco.

If we’re trying to persuade a skeptical audience to believe a new message, the reality is that we’re fighting an uphill battle against a lifetime of personal learning and social relationships. It would seem that there’s nothing much we can do to affect what people believe. But if we’re skeptical about our ability to affect belief, we merely have to look at naturally sticky ideas, because some of them persuade us to believe some pretty incredible things.

The most basic way to make people care is to form an association between something they don’t yet care about and something they do care about.

The lesson for the rest of us is that if we want to make people care, we’ve got to tap into the things they care about. When everybody taps into the same thing, an arms race emerges. To avoid it, we’ve either got to shift onto new turf, as Thompson did, or find associations that are distinctive for our ideas.

The lesson was an important one: the things you choose not to do often matter as much as the things you choose to do. The real test of a person is the degree to which they are willing to nonconform to do the right thing.