Ok, to play your game, that would have been one classroom full of students...instead of four. Not to mention how different the whole thing would have played out if someone got that prick in the dorm at 7:30am, before he could mail his package and shoot up Norris Hall.

It is an interesting point, and I think its something worth considering for a hostage situation. However, in the case of VT, where a killer was free to do his work over a period of three hours, it doesn't really apply.