All, or at least the vast majority, of those people you’re talking about are already Trump voters. They’re going to continue backing Trump no matter who the Democratic party picks. They saw a black guy get elected president, and that radicalized them. They aren’t coming back. Pandering to the imaginary demographic of racists who will surely see the light if we elect the right candidate is simply a losing proposition.
Will there be right wing violence in response to a Harris presidency? Of course there will be. Is there right wing violence now? Of course there is. I understand that you’re tired of hearing the “fuck them” replies, but seriously: fuck them. They are a cancer on this nation. Holding back on doing something good just because you’re afraid that the fucking awful people you share a country with will do something awful just means that you never make any progress.