The whole reason why they are doing an investigation is to see whether or not this will weaken the military, especially recruitment. What is more important, our national security, or allowing a thread-thin minority of the population (who are mostly anti-military anyway) feel warm and fuzzy? The military isn't a social program. We are talking about the defense of our country! And when you are talking about the possibility of discouraging brave young men from serving on a submarine for 6 months sleeping next to a guy who is flirting with him, then the matter is serious. Why not wait to find what the investigation reveals?
Because they know they won't get the answer they want.