IMO compared to helping the poor, its something that should have a stopping point, presumably at least several generations out.
Lastly its also about atonement and making amends, also distinct from poor and even other races / genders with a history of oppression. IE when i lived in austin tx I often walked by a statue near the capitol building, erected after the civil war, whose inscription rejects the outcome entirely. Its bananas that thing exists, or that replacing it would be contentious. Yet here we are.