I know, this isn't nerdy, or geeky, or speculative. But-
On the same day as the Newtown massacre, another miserable lunatic attacked 24 people (all but one of them children) in Chenpeng Village, China.
Now here's the big difference:
He had to do it with a knife, because of China's strict gun-control laws.
And all of the victims are still alive.
Guns don't kill people, people kill people. Sure.
But guns make it a whole goddamned lot easier.