It doesn't surprise me, we give lots of kids mind altering meds growing up, we have violent videos for them to play with, we have more poverty, more broken families,and there is less opportunity for more people than ever before.
I remember looking at gun catalogs twenty, thirty, forty years ago and it was shotguns for birds and trap and skeet, big game rifles for hunting, 22s for small game, target rifles for targets and pistols for hunting and personal protection.
Nowdays if you punch up guns for sale on the computer its page after page of manufacturers making nothing but offensive weapons, all of them designed to kill people.
What a strange people we have become.