And America was attacked by Iraq when? Who is the "aggressor"? Are you saying America is like Hitler!?
Russia did at least pose a potential threat to Germany? Why wasn't Hitler justified in his "pre-emptive" war againt the Soviets!?
I'll assume that morally-relativistic question was rhetorical and that you do actually see a difference between our war against terrorists who would kill us all, if they had the chance, and Hitler's war to establish his "Thousand-Year Reich".