Assuming that your position is correct, how is fighting against gay marriage a good for anybody and at all productive? From what I can see, it serves to divert resources from your stated purpose, needlessly antagonises people who might support said purpose and serves to maintain a right-less underclass. And no the latter's not going to fight for your purpose since they're busy fighting for equal rights.
Like I said - I don't oppose gay marriage - but the argument could be made that by establishing government licensed marriage as "something worth fighting for" it further entrenches the notion that government licensed marriage is a positive social construct.
> the argument could be made that by establishing government licensed marriage as "something worth fighting for" it further entrenches the notion that government licensed marriage is a positive social construct.
But that's a completely useless and unproductive argument to make in the context of the fight being underway, let alone making it while fighting on the other side.