Ugh, this is why I don't like arguing gay marriage. Anti-gay marriage people seem to view it as "protecting society and traditional values". I think our abstract values shouldn't interfere with the rights of other people unless a clear case can be made as to who will be hurt by violating those values. That case has NEVER been made as far as I can see, I hear a lot of "gay marriage will destroy our society", but I see no evidence at all of that. Until someone can show me exactly how gay marriage will hurt people (people, as in individuals, not "society"), all I see is a circular argument: "Gay marriage is against my traditional marriage values, and will hurt society by violating my traditional marriage values."
And the argument that gay people can get married, as long as it's a heterosexual marriage, is stupid. Marriage is about marrying someone you love, if you are preventing someone from marrying for love, you might as well be preventing them from getting married.