You are misunderstanding. Folks marching in BLM Marches aren't speaking for the Black community.
The poster is talking about things more akin to, say, a non-trans person speaking about the experience of being trans or someone who has never went to college speaking for college graduates - when really, they shouldn't try to speak for groups they aren't a party to.
In other words, I can talk about prejudice and racism I've experienced and witnessed, but this doesn't mean that I have the credentials to talk about what it is like to, say, have dark skin in the US and experience that sort of racism. It just isn't the same, and I don't have that experience. After all, I can (in the US) basically just be a face in the crown in a small town.
Two people with the same shade of dark skin, but different in every other way. Are they both part of the "Black community"? Can one speak for the other?
Or is this "community" thing a political thing, where members share a narrative? If so, why do they get to claim the badge of "Black community" from other dark-shaded folk who aren't like-minded?
The poster is talking about things more akin to, say, a non-trans person speaking about the experience of being trans or someone who has never went to college speaking for college graduates - when really, they shouldn't try to speak for groups they aren't a party to.
In other words, I can talk about prejudice and racism I've experienced and witnessed, but this doesn't mean that I have the credentials to talk about what it is like to, say, have dark skin in the US and experience that sort of racism. It just isn't the same, and I don't have that experience. After all, I can (in the US) basically just be a face in the crown in a small town.