So when Syrian Sunni Arabs take over, establish an Islamist dictatorship and explode a nuke in DC, we'll just write that off as the cost of getting rid of Assad? The difference between adults and children is being able to take the long view. Assad tried to evict us from Iraq because he wanted to discourage us from invading Syria. The world's 1b Sunnis want to kill us all. By and large, Assad did not bother us as long as we did not bother him. Sunnis killed 3000 Americans on our own soil on 9/11 despite our record of providing humanitarian aid to Sunnis in Somalia, Bosnia and Kosovo, and rescuing the troglodyte Sunni population in the Gulf states from Saddam's grubby paws in 1991.
What do you expect us to do, help Assad massacre and exterminate his own people like the Neo-Soviet Kremlin is doing?