Ah, but allowing homosexual marriage does infringe upon my rights. Because then I have to pay taxes to the state for benefits to homosexual state-employees. I have to pay taxes to support a child welfare service that supports homosexual adoptions. And I also have to pay higher medical premiums when insurance companies are forced to recognize homosexual marriage.
And in a less concrete fashion, homosexual marriage brings with it a severe coarsening of the culture, and a hatred of many of the values that I hold dear.
I have debated this issue from your standpoint - from an entirely utilitarian, secular perspective that assumes the state exists as an entirely neutral entity with no moral value of its own, beyond a definition of "the rights of man." I'll be happy to give you another argument as to why homosexual marriage is a travesty, and a potential disaster to the health of nation.
You seem to be using one government wrong (socialism) in an attempt to defend another.
Your "utilitarian" argument seems to have more at issue with the current socialist system/tax structure than it does with homosexaulity. Why not let gays exercise their individaul liberty and just change the tax structure?