IME dealing with these types, it's also people who lack control in their personal lives.
They enter spaces & start dictating how others interact with media, because it's the only place where they have some semblance of power (even if it's gained thru bullying, dog-piling, and other fear tactics).
a great dissection of why a lot of fandom drama doesn't only boil down to "these people are thinking too much about [insert series here] and need to touch grass."
there's another layer to the way folks get obsessed (for parasocial/self-important rewriting/clout reasons, etc) that gets glossed over