Why would anyone want coop? I hate people. They ruin everything.
Since many Elder Scrolls fans seem to be only willing to listen to the developers, there's a quote from Bethesda regarding co-op in Skyrim that can answer your question:
'It's not wrong or unreasonable for people to want to experience a game with their friends, or want to do things with folks online. There's nothing wrong with that at all."That you yourself can't understand that is just.. odd. That you hate people for wanting to play in a game world along side their friends is even odder. In the end it's actually close-minded outlooks like yours that can and do ruin everything.