I think for some kids it could make their teenage years more difficult and that may not be fair to the child.
That is my only hesitation. I have no doubt that many gay people would make great parents, that is not in question for me.
Try being a gay teenager and see how hard it is then. (been there)
The reason "it's more difficult" is because of social attitudes (such as your own and other people) towards gay people that it would even be an issue.
The state doesn't have any kind of "final say" on how society should be, but giving official sanction towards gay marriage/adoption is just that and over time it will become normal, which is the entire point.
Don't put words in my mouth or suggest you know my social attitudes.
I agree as I have said in a previous post its only a matter of time before this whole discussion becomes irrelevant as change will come eventually.