The thing is that from start to finish the entire shooting in Newtown was something like 5-10 minutes. Really, even if there is a single cop on the scene, it would take at least one-two minutes to run from one side of the school to the other. Add in response time from the first shot being fired to the cop responding, and you're looking at close to half way through the carnage before the cop gets there.
Then what, he's only got a hand gun against a guy in body armour. Unless the guy's a marksman and hit the guy in the head from 20-50 feet or further with a handgun, then he's not going to be much help, especially when the target can spray the area and he himself doesn't have any body armour.
So really logistically having a cop on scene isn't really going to make a difference, and would more than likely be the first guy shot, and would most likely just add another body to the pile.
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