Let's not forget all the lives that could have been saved if any of the teachers or other adults at that high school had been legally allowed to be armed. They could have stopped the rampage early,merely by shooting the bad guys at the start. Or even have prevented it from happening at all because the two murderers would have known there would have been armed people there who could have stopped them. Did you notice they didn't start their killing spree at a gun club or a police station? They didn't because they wanted a easy target where there was nobody in a position to fight back or stop them.
As for guns not stopping crime,when was the last time you heard of a uniformed cop being mugged or raped?
That's the real reason for gun control. There is no other.
Kubrick conveniently leaves out the fact that the kid's old man failed to challenge the kid for having a pipe bomb factory in his bedroom, along with various kinky posters.