It's being willfully blind to deny that there are other situations with possible negative outcomes that aren't being mentioned. Also, we're talking averages, so the fact that one child has same-sex parents doesn't automatically mean a child with a traditional upbringing is in a better situation.It's irrational to think that there would be any other outcome....
1. No. The Gold Standard is the traditional nuclear family. Comparing gay couples to that is certainly called for.
2. Yes, you are completely right about averages. That is incredibly rare for liberals to understand. Are you sure about your choice of a clown avatar?