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They are something of a joke now but they might not always be. That requires diligence on our part to see that they don't return to their 'glory days' of power and influence. And I think that's served best by not forcibly shutting them down but allowing them, and others like them, to die out on their own naturally, if that ever happens completely. We can't force people into acceptance, if some idiot (my term) wants to think the colour of someone's skin makes a measurable difference, they are going to think it. Where we, as the majority, need to step up legally is in preventing such groups from enforcing their worldview on the rest of us, think job or housing denial on the basis of race, etc. Where we need to step up socially as a group is in counter protest, such as the OP highlights.
Where I feel a measure hope for humanity is that when we do step up to counter protest. we're doing so in a more positive way. In other words, we aren't sinking to their level. Now, world over we have a hell of a long way to go but it's the little glimmers of hope that can help to drive us, and inspire us, forward.