The problem is that we see the positive results, but the negative are swept out of sight, and because it's a new idea, we won't see the results for another 20 years or more.
So, what happens after 20 years and we see that kids raised by same-sex couple's are dysfunctional emotionally and can't tell right from wrong and we have a new subculture of adults living on the fringe of sanity ? It will be impossible to reverse the negative on such people and we'll have to live with the consequences.
Heck, I was watching the news about the riots in Milwaukee the other day, and they were interviewing some of the rioters, including the brother of the suspect that was shot by the cops. The level of ignorance and incoherent vocabulary was shocking. However, thinking about it, they are the result of social engineering 15-25 years ago, where being a single mother was not a problem and even celebrated in their social environment. The kids had no father and an incompetent mother who essentially abandoned them to the streets. We mow have a subculture of barbarians in the inner cities of America.
I'm not saying this will be the same result of kids raised by same-sex couples, but I have seen the negatives from such kids who are now coming into adulthood. Its only a matter of time before we'll know whether or not, gay parenting is as good as traditional parenting with a child having a mother and a father.
Jim