This is a bad analogy. Civil rights legislation came through not because hardcore racists were convinced that their hatred was illogical, but by turning people who considered themselves moderate on the issues. The hardcore racists had their best tools for institutional prejudice taken away from them (often via the courts and not via legislation), which gave more room for a conversation, and through those conversations, those hardcore racists became ostracized as more and more of society was dissuaded from taking their positions as something reasonable.
Trying to follow that model in the case of GG would not mean trying to have serious conversations with people who remain in the movement. A similar tack here would be to get the judicial system to actually enforce penalties for the ongoing harassment, which might open up opportunities for conversation.
Well, that, or cause another spark of outrage in GG, whose actions are basically the best PR you could have to help defeat them.