Look at the alternative. Mass shootings every two weeks or so. Living in fear. If I had kids in school now, I'd be scared every morning they left the house. And it's only going to get worse.
I have a daughter in the eight grade. School started today. I share your concerns and sending her off scares me as well. I can't fathom the thought of life without her. I have to put my trust in the school and their security measures just like millions of other parents every day.
You mentioned 3 people who were killed by bad cops. I'll give you 2 more that come to my mind immediately ...... Justine Damond and Daniel Shaver. Look them up. Bad cops shoot white people too.
Evil comes in many forms. A firearm is not inherently evil. There are people who are evil. Some of them are cops.
I have to wonder why you'd start thread about life where only the police and military have guns when you, like me, don't really trust the police that much. I won't say I wouldn't ever trust the police but I'm a law abiding citizen and if I never have to run across another cop for the rest of my life it wouldn't bother me a bit.
Remember, when seconds count the police are only minutes away.
My guns keep my home and family safe because that's not the police's job.