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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.
Do you think the Columbine shooters would've gotten anywhere as far as they did if all they had were a kitchen knife and a machete? Guns enable mentally ill individuals to commit acts of mass murder in a way that is impossible in gun-free societies.