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I wanted to share an article but after read/scanned ~6 of them - I had nothing to share. They weren't any good. I wish blogs were still a thing. Blogs can be excellent on topics like these. Here's the Wikipedia page - Columbine High School massacre.
I remember reading Dave Cullen's book on Columbine and he basically blames it all on the shooters' mental illnesses. Like it all happened because the psychopath and the extremely depressed kid (both post-humously diagnosed) were codependent in their violent fantasies or whatever. I don't recall any more than maybe a passing reference to nazi ideology in that book, pretty disappointing considering 10 years of research went into it