I didn't join this site for KH at all, nya, but rather for somewhere else to go because KH3.org has become boring. More than anything, I joined because some of my closest friends from there did also, so I believe that people are a bigger reason to join a forum than whatever the forum is mainly about.
As for myself, I think KH is alright but I'm not going to fangasm about it at every chance I get. There are a lot of things I dislike about it, too, and I would freely rant given the chance - does that mean, in your opinion, that I have no right to be here either?
There are certainly more important things in a forum than just their main topic, so why get so upset about all the people who've joined here who either hate or have never even played KH? Seems a bit pointless to me. Trolling, however, doesn't even have anything to do with it.