Regarding white supremacists, my take was that he lumped ALL of the "whites first/whites only" groups as "white supremacists". I think the other group he mentioned would be people that are not racist that think we shouldn't try to hide from our history. (I fall in this group)
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I don't think the Confederate flag belongs in our government but ripping down statues? I realize that some look on these things as monuments of their twisted ideals, there's NOTHING we can do about that. If you remove these statues, they'll idolize something else. Instead of ripping down statues and attempting to erase our history, lets erect statues of black heroes. (There's plenty to choose from)
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Unfortunately slavery is a part of our past. We need to embrace that as one people, learn from it (as one people) and make sure that it stays in the past (as one people). If we hide from or ignore our past, we are doomed to repeat these mistakes in our future.