Earlier quoted context omitted.
The slope is not nearly as slippery as you're imagining it to be. I'm not sure literal white supremecists are the shining beacon upon which you want to hang your argument (if I'm wrong on this, you don't need to read any further). We're not talking about a controversial political opinion, we're not talking about coastal liberals shutting down good American conservative free speech, we're talking about white supremeci…
Is the only food store in town, who is ran by a racist, allowed to starve black families by refusing them service because of their skin color? Are tech companies across the board allowed to shut down, disenfranchise, silence, and marginalize people and businesses because they simply disagree with their lawful politics and ideas?
What if those politics and incitements aren't legal (or ethical) because, at a general level, they violate the law specifically but the harm principle more generally?
Would you be okay with taking action then?