We are brought up to believe that tolerating people is a basic moral good. But this simple approach fails, and can easily be used against us by people who say "Why won't you tolerate my intolerance?" This can happen in everything from our personal lives to the political arena. But it comes from a misunderstanding of what tolerance is.
The way to understand tolerance isn't as a moral absolute: it's as a peace treaty. The difference is that a peace treaty only applies when both sides abide by it.
This is an essay I've had brewing for some time.