> Second, "colloquial" definition of a war crime are Geneva convention violations.

The other "colloquial" definition of a war crime is "things we prosecuted the Nazis for at Nuremberg".

One side here is playing "world's police", so this "but those people (that we've painted as fundamentalist extremist terrorists) are committing war crimes so why shouldn't we get to, too?" isn't exactly the fine upstanding argument that you seem to think it is, just as it's not when the IDF responds to children throwing rocks at main battle tanks with live ammunition and turning off the power to a country for three days.