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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.
Enforcing gun control laws also means relying on the police, whose ideologies are identical to those of school shooters. European countries manage to moderate rightwing rage with the kinds of concessions you mention here, but the USA is a settler colony and also requires its settlers to be armed more or less all the time in order to stave of their inevitable defeat for as long as possible. There is no way out of this situation for as long as the USA exists, and I say that as a parent with kids in school.
Honestly we're at the point where I'm surprised the liberals aren't calling for a mass purge of police forces. If the people upholding the "law and order" they supposedly care about so much overwhelmingly support Trump, you'd think that'd be worrying.
Liberals don’t oppose people like Trump, they require constant fear of people like Trump to legitimize their nearly identical politics.
Why would liberals want to purge the police? They love cops.