“We see a promise as a personal law, and we see the people who break them as private-life criminals. We think it automatically, one of those truths that just is to us: breaking a promise is a bad, bad thing. A promise can be as buoyant as whispered words or solemn as a marriage vow, but we view it as something pure and untouchable when it should never be either of those things. If a promise is a personal law, a contract, then it ought to be layered with fine print, rules and conditions, promises within those promises, and whether we like it or not, it ought to be something we can snatch back, that we should snatch back, if those rules are violated.”