You are aware that there were free blacks who owned black slaves back then ... aren't you? Slavery is a bad thing but I'm not guilty of owning any slaves nor are any of my ancestors (that I know of). If I commit a crime I should pay for it. If I do NOT commit a crime I should not pay for it. Simple math!
I see you missed the points I outlined as well. Since you are new I will repeat them. This is not a hunt down the descendents of slave owners like the guys would have you believe. This is the US paying the tab for Black Africans being enslaved and making the US an economic world power without compensation.
Slavery was wrong.
The US allowed slavery (to address your point)
Reparations are used to right a wrong.
Ex-slaves were never paid reparations.
There has never been a system in the US that benefited only the descendants of slaves.
Japanese were paid reparations via tax money by the US government setting a precedent.
Presidents have announced slavery was wrong fulfilling the criteria of the first point.
There is no expiration period for reparations.
There is nothing that says reparations has to be paid to someone living.
See if you can intelligently argue these points since so many have failed to address them.