This is kind of the reason it was formed - people are allowed to voice their opinions as freely as they want and some fans (and others) find it hard when the fans of this spot refuse to hear anything against their beloved Edward.
It's not just for people who don't like Twilight it's for fans who are willing to see the flaws and would like to discuss it. I like Twilight but nothing is perfect and I don't think the series is perfect. What's wrong with discussing a topic? And who cares what anyone else thinks? If you think a books good that's great you don't need to strike against people who don't have the same opinion.
I said this in a comment but I think it's another good point. Another reason it was formed was to stop you all from firing up. Surely since it's not on this spot and people are saying possibly negative things about the series it doesn't affect you. Because there are anti fans out there who want to voice their opinions the only appropriate, fanpop-friendly way to do it is on another spot. If you don't want to hear people saying things you don't like, don't visit the spot and leave everyone on there in peace, we're doing it for you on here aren't we?
I would also like to show you guys the spot rules:
link
They clearly state it isn't an anti-spot and it doesn't want to be one.