I've been thinking a lot about the PTSD thing, and I have to think there's got to be additional factors that make people do things like this. The guys that came back from WWII, The Koren War, Vietnam etc....
They've seen the same hells that younger generations have and these kinds of things didn't happen with the frequency they are now. I'm not sure what it is, but people just seem more batshit crazy these days.