That means that Hargrove's promotion of Juneteenth is hypocritical and he should certainly give his entire estate and sign over his income to the descendants of slaves or to Mrs. Clinton's campaign before pleading publicly for forgiveness. Or he could switch parties and attack gunowners and all will be forgiven and his hateful horrible heritage will be expunged.
No. Actually, it's quite the opposite. His point is that he would rather support a positive statement about the end of slavery, which of course was a positive development, than to approach it in the negative way of trying to cast blame now onto people who had nothing to do with it in the first place.
I have no idea why anyone would consider the celebration of the end of slavery a bad thing.