Because what other music genre will fuel their basic human need to bathe in shit and rape corpses?
It is definitely not for everyone. If you can't handle music that is brutal, then you shouldn't listen to it. Stick to the Backstreet Boys or other softcore music that you like.
I'd like to murder the homo who decided we need all these stupid subgenre names.
Some grindcore isn't that bad. The early stuff is okay, but the newer bands have output that is just a mess. I pretty much only have two bands I like that fit into this genre: Napalm Death and Cannibal Corpse.