My best argument is that gays have successfully been included in foreign militarys with none of the detrimental results predicted by many in our own services. That alone should be sufficient evidence.
But if it weren't, there's the evidence that gays have been integrated into police units, firehouses, S.W.A.T. teams, the FBI, the CIA, top positions in corporate America, and in all levels of government. We teach in the schools, perform brain surgery (yes, I really know a gay brain surgeon), and we do just about every other job imaginable with little or no difficulty getting along with others.
The facts and the evidence are all on my side.
Your argument is based on consensus. That's no argument at all.