Personally I think it's because society is screwed up and intolerant. I know that I myself have a lot of pent up rage because of the way that Danish society is, I'm different in my home country and I am more or less an outcast.
I believe that the people who become outcasts or are forced to be someone they're not in order to be accepted are the people that do these things.
Of course, tighter gun laws to ensure that guns would be harder to come by wouldn't hurt either.
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