Near the start of his book, “The Conscience of a Conservative,” Barry Goldwater wrote: “Every man, for his individual good and for the good of his society, is responsible for his own development. The choices that govern his life are choices that he must make; they cannot be made by any other human being.” The political implications of this are clear, Goldwater continued: “Conservatism’s first concern will always be: Are we maximizing freedom?”

Goldwater’s vision was highly individualistic and celebrated a certain sort of person — the stout pioneer crossing the West, the risk-taking entrepreneur with a vision, the stalwart hero fighting the collectivist foe.

The problem is, this individualist description of human nature seems to be wrong. Over the past 30 years, there has been a tide of research in many fields, all underlining one old truth — that we are intensely social creatures, deeply interconnected with one another and the idea of the lone individual rationally and willfully steering his own life course is often an illusion.