The topic was specifically "Killings Committed by White Extremists" which is by definition, race motivated political violence.
I don't recall a period of time when white people hanging from trees was a "thing". Perhaps you do.
There are no statues of Hitler in Germany, as you may recall... but when black people started asking to be treated as human beings, statues of confederate traitors suddenly went up all over the south. Now you're arguing against erasing history. It's about heritage, not hate... as if treason is something to celebrate.