I think the main point is showing solidarity, even for content that does not directly benefit them. There's nothing wrong with sex and nudity, but everyone will have different personal lines in their day to day life.

>must loudly proclaim it's not "their thing" -- but violence, guns, war, etc are not?

I don't think war or violence is most people's thing to begin with.

Guns, that's definitely a thorny issue. Especially in the US. I'm personalyl fine with much stricter gun control

>we all know they are not going to stop at this, right?

indeed. It's not the first wave, it won't be the last. Gotta do the same thing either way and push back.