We treated them back then, Einstein.
Committed, not treated, but off the street anyways. We don't do this anymore because we would be infringing on somebodies right to the pursuit of happiness or some [Bleeeeep!].

How many kids had semi-auto with 30 round clips 50 years ago? None.
Doesn't matter how big your clip is, they still didn't go around shooting up kids. All the shootings you listed were Ideological or political, what happened last week had no purpose at all, unless it was the left trying to get gun control back in the big picture(for all you conspiracy theorists)

I'm going to go out on a limb here and say there is no one cause for any of the problems our society has, it's a combination of issues, and different issues for each different incident. If you blame video games, why not music, maybe they listen to to much LMFAO or RAM. Maybe to much Neil Diamond and they just go off the deep end. Maybe chemicals the gov't puts in outr food. Who knows.