We need to accept that some of these ideas ... are inherently dangerous. Maybe but somehow we don't focus on dangerous ideas. Communism is by far the most dangerous idea devised in the west. It infected dozens of societies and led them to a century of poverty, slavery, and hundred million deaths. Yet someone who's open about being a communist won't really be ostracised in SF. Communist flags are available on Amazon.…
If you go into a startup and say "I'm a communist," many of them are going to be pretty skeptical of your ideas. You will find yourself in a lot of awkward conversations if you make this a thing you want to talk about.
If you pitch a VC and throw in "btw, I'm a communist," or they find your online writings about being a communist, you aren't getting a check.
If you apply for upper management at Google and you say "I want to overthrow capitalism because I'm a communist," you're going to have a really, really hard time.
I don't think it's arguable that communists are actively operating in America and causing capitalists to have longer jail sentences or killing them when they wouldn't kill communists. So, no, I don't think communism is a threat whereas anti-semitism and racism are immediate threats.
I don't think that we need to jail all people who are racist, but I think it's just fine to not talk to them or to yell at them or even to fire if they feel the need to express their beliefs in a way that gets in my business or stops me or my team from doing our work.