Because battle of the alpha male :v या female cos equality :LL या तारा, स्टार cos tumblr. Who would back down from becoming alpha star? फैन्पॉप be like the animal kingdom. चोटी, शीर्ष user gonna get आप all the betches. Alpha fanpopper gonna दिखाना their manliness. Alpha fanpopper gonna दिखाना dominance and make wallposts and polls. Bitches प्यार wallposts and polls.
Cuz people respond to negativity with और negativity. Sad, but true. Even I'm guilty of this. It's not just Fanpop, though. आप should see YouTube टिप्पणियाँ या IMDb message boards (before they decided to shut down the boards, of course). YouTube and IMDb have the worst people, though Fanpoppers are no saints, either.
It is not just Fanpop. आप will see fights pretty much everywhere. On other websites too (which I have seen far worse) as well as in real life. Not everyone can get along with each other. If आप want a specifc reason it varies. Some just do it for fun, others because they want to get out some of their tension as there are also those who get offended pretty easily या for no reason etc. Either immaturity या mental condition on a specific moment can play a crucial role in that !!!!