The US got (justifiably) yelled at for the war in Iraq, and again (less justifiably) in Libya and Afghanistan, and took the leas that military interference is always wrong, despite the obvious counterexamples of Syria and Crimes.

This is complicated by a lot of the yelling coming from US peace activists, who took advantage of their complete vindication in Iraq (and Vietnam before that) to pretend that there's a through-line and preventing a dictator from bombing dissidents or a naked land-grab-war-of-aggression is identical to starting our own naked-land-grab-war-of-aggression.