Rhetorical cash cow guaranteeing regular payments of Decent Dole to newspaper columnists who have become too senile and incoherent to earn a living, as regularly paid by Slate, The Guardian, Standpoint and the Times.
Originally attributed to Comrade Hitchens, the Formula is expressed thusly...
Did (American action X) cause (atrocity Y)? No!
Rinse and repeat as needed. See also: Condemnit!