Dr Tentacles = "If a scientist screws up, other people will jump on them, to advance their own career."
Unless, of course, you end up vindicating the common enemy of all science: religion.
The gay rights issue is a great way to make religion look like the big scary boogeyman.
It seems to me that many scientists are rather indignant about the fact that they still have to share the 21st century with religion. I remember hearing Richard Dawkins saying something along the lines of: "The 21st century should time of reason, instead religion is on the march and stronger than ever."
The attitude seems to be "this is our world now, what are you still doing here?"
Someone once said to me something to the effect of: "Scientists who believe in something very strongly, especially if it gives them a sense of intellectual superiority over other people, will never stumble upon a fact that challenges or shatters said beliefs and say "oh look, here's a fact that changes everything I believe in, best let the world know.""
I apologize for my cynicism, but I'm fed up with how "what science says" is being used to try and quickly end debates on which the jury is still very much out. History shows us that "what science says" is highly dependent on the general worldview of the majority of scientists in any given time period.