Well, it's not really worth dwelling on, but since I made the news and everything, what the heck.
I was responding to chachacha's remark that "Things like this prove that slavery was wrong for more reasons than one would expect. The fact that they are still here is one of them." - meaning slavery was wrong because it brought all those black people here. Rather mean-spirited, I thought, so I was responding in a "now, now" kind of way, and affirming the value of diversity by saying that was what made slavery RIGHT.
I then expanded in airy fashion on the immutability of past events. They are a "condition of our existence" - if we accept our existence as it is, and deem it good, we have to accept the events of the past as they happened. Note how this happens with wars. Think of Civil War reenactments. This is a recreational activity, and a positive thing. The Civil War is History, and History is a positive thing, no matter how horrible the Civil War was in actuality.
The whole idea is clear as mud ( I did call it paradoxical and weird ), but this was the nature of my musing. To have my very liberal-minded remark snatched up as an example of nastiness is certainly ironic, but it is not new to me by any means.
I would just further add, that my quote was actually edited. The short sentence "It WAS." expressing the immutability of the past, was deleted. It's hard to be charitable about the motive for doing so, short as it was ( ha ha ). I think it got in the way of his presumption that I was crudely expressing a belief that slavery should be reinstituted, and so - out with it.