Would it not be the equivalent of a what supremacist gang get into the army and get trained and do a couple tours here and there. Comeback home and all go to Canada and pull off a deadly attack? Should the US be blamed for training the group that messed up Canada? Or does the US get a pass because we are a hegemony?
America does give military training to white supremacists and gang members. They then usually attack Americans, though. Some reports hold, in fact, they put one such individual in charge of the Department of War.