Some would say the citizens' firing on Fort Sumter, S.C. or the election of Abraham Lincoln, perhaps the worst General the Army ever had. (What, you say he was the President, not the General?) Or, when he declared in the Emancipation Proclamation that the slaves were FREE.
Man has always been selfish and aggressive (some would say violent). Our demise, like that of Rome, has long been coming, and is nearing fruition.