I think part of it is that if you go into any ghetto or slum in the US that black people are going to be vastly over-represented there. And regardless of whatever the current situation in this country may be, I think it's pretty undeniable that historically blacks in the US did suffer a lot of discrimination. In terms of the East Asian immigrants, the ones fresh off the boat may be poor, but generally after a generation they've been able to achieve some sort of quality of life on par with your average white American.Could there ever be a comparable movement for Asians - like Chinese people or Koreans? Say even if a cop kills a Chinese guy on spurious grounds? I doubt it.
So when you have a group people largely on the bottom rung of society who have been historically discriminated against, it's easy to see how someone would come to the conclusion that they two are directly related. If it's someone from a vast majority white state who has little to no experience with black culture, it's even easier to see why someone would think so. Now, I'm more inclined to agree with what seems to be the majority opinion at RVF that the reason blacks are so over-represented at the bottom is more due to the welfare state and destruction of the black family than from systemic racism. I won't say that racism has literally nothing to do with it, but I think it's a relatively minor factor.
Where I work they recently had a thing a couple weeks ago they had a thing planned by the administration where a high-ranking person (white man, of course) got on the loudspeaker and asked everyone to stand or kneel for 8 minutes 46 seconds to protest racism against black people. All I could think about was how spineless this guys was for capitulating and doing this (and I don't think there was anybody with a pitchfork at his door forcing his hand). My workplace is very diverse (actually diverse, not as in there's some black people working there), so I don't think there's any one predominant religion among the staff. It's almost like by having this thing and asking everyone to kneel in unison it's like the new secular religion everyone is supposed to follow. The old definition of piety is out the window, but it can't just be discarded without something taking its place. So this is what we're given.