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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.
Why couldn’t they just ban guns?
Asking as a British citizen
the gun lobby and gun manufacturers are too powerful to allow that
In other words, same reason why tobacco could not be banned.