>> But trigger warnings are a really simple common courtesy.

>No, they aren't. They are neither simple, nor are they,

You are mostly right, but there is danger here.

Traditional courtesy and political correctness do overlap a lot -- they tell us to do the same sort of things. They are not the same. As you suggest, personal consideration is not the same as political sensitivity.

But when the backlash against PC comes, that too is a kind of political sensitivity. Fear of being PC can lead people to be offensive when they would otherwise have been polite.