This is an interesting thread: it's brought up many issues. I understand the OP's position, but it shows how very far we have moved in our thinking of society .
On the realpolitik one, there are quite a few people who think the relatively recent Irish peace agreement is fatally flawed by not bringing some people to justice but there are those who who point out that without accepting that, no agreement would gave been reached and yet another generation would have suffered. Governments usually need to compromise in a democracy (and there have been er few reports of virtuous egalitarian pleasant dictatorships that achieve good outcomes).
To expand the Oldie's most recent point, I was at a family dinner a few years ago. Some of the family is from the subcontinent where some still are, some left in the 19c and did exceptionally well, now rich and powerful in their area. One bit of the European side apologised to one bit of the subcontinent side for the behaviour of the European ancestors to get the response " thank heavens you did. Otherwise we'd still be incredibly poor in X."
I know that's exceptional but it was an interesting an unexpected viewpoint.
I feel guilty because of the behaviour of my ancestors: even though I have not benefited materially, I have benefited from increased aspiration. I find the guilt illogical but try my hardest to assuage it by making sure I work in my private life to benefit those at the harder end, wherever they come from.
What I do find repugnant is that France kept Haiti's to its repayment of the freedom debt interest, paid off finally in 1947 ( I think).
What I find heartening is that whilst Christianity accepted the institution of slavery, it is quite clear that early writers believed that slaves -and women- had souls, " in Christ there is neither slave nor free, neither male nor female". Which is why, imv, poor treatment was/is even worse: there was no scriptural justification for it at all, even if slavery itself was "justified" as indeed it was by some of the Confederate side ( not Lee, who was an abolitionist).
And which is why the Wedgwood medallion, Am I not a man and a brother, was so important in bringing home that truth, so conveniently ignored.