They do not in fact. They insinuate that police is arresting blacks as a modern sequel to slavery. That's a complete reversal of cause and effect. Blacks are disproportionally targeted because they're committing criminal acts at disproportionally higher levels compared to every other "marginalized" minority. There's a reason the 13/50 trope exists for blacks and not for Asians.
I agree, but just because blacks commit more crimes, it is NOT valid to harass innocent blacks. When you harass innocent blacks, you have more resentment from general populace. It is easy to see all blacks as criminals when all you see every day are black criminals, because you are a cop in black criminal neighbourhood, but such stances will make all black people hate police. It's not "EITHER blacks are disproportionally targetted OR blacks commit more crimes". It's both and it makes for vicious cycle of violence. Someone has to stop it. Because police doesn't or can't stop it, blacks are trying to do what they can, which is to protest. Then when people protest and no one listens, they are too angry (too many various reasons to specify), they resort to violence and you have riots.
Indeed, that's why disproportionate targeting still exists. We've forgotten that the police policy that BLM objects to now was supported not long ago by Democrats and black community leaders, because crime was a major problem, but now we're starting to remember.
The standard historical answer is that our society caused it, not just with slavery, but with redlining, ghettos, and voter suppression.
Black people are also a part of society, they are not just passive participants, by the way.
I have read a bit about the situation in the UK, and it seems a major problem is gang culture. The "stop and search" strategy is actually a measure against gang activity, not simply a racist pastime. Whether it is the best approach can be discussed, but people should come up with better strategies to prevent gang crimes and people growing up to be drafted into gangs, not simply cry "racism".
Maybe "white people" somehow caused gang culture to appear (maybe!), but now that it exists, it is not so simple to get rid off, and imo also too simplistic to say "white people are to blame, so they should fix it". There are a zillion problems in the world. Even white people were not put on earth with silver spoons in their mouths. If you see a problem you care about, work on improving it. Blaming white people does nothing (except harm).
I think there are more black people in the US than people live in Switzerland, for example. If everything else is so racist, they could work together and build their own black subcountry with better services. Like they could offer health care to their black peers. No need to wait for white people to provide it.
It's about culture, choices you make and choices that are available to you (in ghetto, you may have no choice). The most memorable photo for me when those discussions appear:
https://twitter.com/elijahschaffer/status/127081025725892198...