I think your describing a type of logical fallacy but can’t quite pin down which one, https://youtu.be/pCg-SNOteQQ?si=SOFIkZBm1syuedfc this is a really short informative video on the topic and I would research Karl Poppers Paradox of Tolerance to get a better theoretical understanding of why their “opinions” are so harmful when they are not met with resistance.
John Brown gun club or Socialist Rifle Association are out there… also there are plenty of paramilitary and social fascist groups to protect yourself against. Proud boys, border nutjobs, don’t listen to naysayers about learning to defend yourself. It’s not just military with tanks and planes. It’s your back the blue neighbor you have to worry about…