Well in a lot of "thriving" neighborhoods full of blue collar workers, one day black people decided to move in. The blue collars, concerned about property prices dropping and the neighborhood not being as nice anymore, moved into the suburbs. That's why you'll see large black populations into certain areas of big cities.
Now why did the new people moving in and the old people moving out lead to such drastic changes? Well, with the property prices being driven down, local businesses also left. Could new places have popped up to replace those businesses? Sure. I'm personally not informed enough to answer stuff like that and you'll probably need to talk to someone with a history degree to get a more comprehensive picture.
Also, a lot of the businesses employing blue-collar workers downsized or went belly-up. Why? Again, not sure. But yes, black people moving into certain areas led to those areas turning into "bad" places which sucks for everyone involved, especially the black people. Was there racism involved in the decision of white people to move out? Yeah, probably. Does that mean it's their fault? Idk, maybe, maybe not.
But what people need to focus on is improving those places, not making them worse and shit like riots and high crime rate in those areas doesn't exactly help. Like that cop in the video I posted said, over 80% of shootings and murders are committed by blacks and when they start riots because one of them gets shot by a police officer it can make some seem like hypocrites.
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Mike walked away, ran away, whatever then came back. After being shot, with his hands up. Surely there was another option as opposed to pumping him with bullets. I am not defending him, if he did indeed attack the cop, but I refuse to believe there wasn't a better choice.
Idk, dude. If I'm a cop and someone tries to attack me, I'm going to assume they mean to kill me. Plus, you don't know if the guy's packing or not.