Check this out...this should tell you all you need to know:
https://en.wikipedia.org/wiki/School..._United_States
School shootings are through the roof NOW. But not so much before.
Even in the 1920's and 1930's when people were running around with actual machine guns...it didn't happen.
I think it's definitely a societal change we are witnessing. A loss of respect for life, etc.
And with this change...we may actually need to disarm our citizenry.
Won't stop criminals from using illegal guns. But it might stop this kind of thing from happening.