What is that really bothers you about legalizing gay marriages?

Okay, thinking rationally here. We know that they aren't pedophiles. We know they won't rape our children, even though idiots claim this with no evidence. They are going to be intimate in public just as heterosexuals are whether they can get married or not. So why try to stop allowing them to get married? What harm do you really believe can come from homosexuals being allowed to get married?