I am of the opinion that if other people living their own lives can easily threaten your marriage, there are issues that need to be worked out that have little, in the end, to do with said other people. I don't really understand -- I truly don't -- why this is such a big issue for people. It's not like having legal gay marriage is somehow going to force you to suddenly switch your sexual preference. Look, on a purely pragmatic level, happy, committed couples are more likely to have a stake in the community in which they live. Happy people usually want other people to be happy. They are just much more pleasant to have as neighbours.
So...do the people who hate this idea so much live in a crabby, enclosed little space in which they're unhappy enough to assume that everyone should suffer?
I know that some people point to children as a reason why gays shouldn't be allowed to marry (they can't, on their own or without intervention, have them). But no one seems to care if a heterosexual couple chooses not to have children, and I fail to see how this is fundamentally different.