Two plus two equals five. I mean, I really want it to be five. So let’s just pretend it’s five and, before you know it, it’ll be five. After all, we are the ones (or is it the fives?) we’ve been waiting for. My narrow-minded opponents, stuck in the mathematics of a bygone time, would have us make a false choice between elementary addition and our values. But as James Madison or James Rosen or somebody said, “The arc of arithmetic is long, but it bends toward, um . . . five.” That, it seemed to me, was about what...