Dunblane in Scotland could hardly be said to be overcrowded, but a lunatic massacred all those tiny children and their teacher in a shooting. I'm not a psychologist, but it's often said that these individuals who go crazy and kill everyone in sight have a deep grudge against society. They feel no-one considers or respects them. They have no friends and are isolated. And they are severely mentally ill. I'm wondering if this chap was a paranoid schizophrenic? (Please don't think I'm excusing what he did, I'm merely trying to explain it.) And guns IMO aren't the issue. There was a serial poisoner (Graham Young) in the last century who did the same thing, killing dozens over the years, with arsenic. And of course, terrorist bombers don't use guns either.