There is no explanation why they feel the need to show up out of nowhere, but often times they are parroting an off-the-shelf set of edgy opinions that one can pick up off 4chan/Kiwifarms and use as a personality. There’s a whole lot of folks like that, and sometimes people in this group that compulsively regurgitate edgy youtuber clickbait in lieu of practicing critical thinking also can be dangerous!
This makes sense because they’re usually not actually expressing personally-held opinions, they are performing a cathartic act of being contrarian in order to cement their position as being both smarter than average and signaling that they’re part of an orthodox group. It’s a lazy performance of disgust for the sake of attention.
To further respond to your original question, these people that value performing disgust using pre-digested replacements for personalities can sometimes become dangerous! And there are a lot of them!
[0]: https://en.wikipedia.org/wiki/List_of_people_killed_for_bein...
https://williamsinstitute.law.ucla.edu/press/ncvs-trans-pres...
Simply citing a study that makes no attempt to control for rates of prostitution does not disprove my argument. Repeating a myth does not make it true, even if you repeat it over and over again.
I was fortunate to have been well practiced in drawing and discharging my mace canister or it could have been significantly worse. A lot of physical trauma can be (and was) inflicted in 5 seconds.
This is not a particularly exceptional experience among my other non-cis friends. Not all of have suffered violence, but being threatened with it is nearly universal.