When I was considering a worst case scenerio I was thinking about a very easy scenerio. Of course a nuke or chemical bomb in NYC would do more damage than killing thousands of children all across the nation at the same time but I was thinking of a feasable situation. Getting a nuke to blow up WAS, NYC, and LAX is of course worse than small bombs over schools but the nuke would be near impossible.

Of course there are ways to top even bombing just the US. Why don't they bomb everywhere except Mecca and Jerusalem (assuming they are Muslim terrorists). Or everywhere except the Vatican and Jerusalem (if Christian). Or even everywhere except Israel (if Jewish). Of course there are far worse situations than killing of some children though in ease of an attack I don't know. (not to give any terrorist group an idea)

Any group that could create such a terrible attack has my respect, an evil and deadly respect, yet respect all the way.