The reason we should be paying for foster kids' college is because the state is their parent, so it's our responsibility. In a country that wasn't shit, regular people would be jealous of how kids who were wards of the state lived, and how well-raised they were. There's no clearer illustration of our values than the fact that children who, through no fault of their own, have become the responsibility of the state are treated like unwanted trash. The idea that a society like that could figure out how to ethically treat prisoners or immigrants is laughable.
I think nobody argues that it's a vile, morally repugnant thing to enslave another human being. But that was a long time ago, and all those slaves and the people who enslaved them are all dead.
The descendants of those slaves are now much wealthier and better off by pretty much any metric than their relatives who were not enslaved. How do you make an argument that those descendants are victims in need of reparations? No crime was committed against them directly, and they seem to have benefited from the crimes committed against their ancestors.
I must stress that this is not in any way excusing or justifying the wrongs that occurred. But how would you make an argument for reparations, given how things turned out?
How do reparations actually move the relationship forwards? Handing out money does not solve anything fundamentally. They need to focus on understanding and building a positive future for all, which means working towards ensuring legally and policy-wise there is no remaining racial bias or discrimination (equal opportunity for all - not outcome) and working away from holding the grudges of previous generations.