I don't know all the answers. I just look to folks who are supposedly our moral leaders and I don't see answers or moral action.
Homosexuals are everywhere here in MA - can they all be inclined to incest?
If I may, I do not believe that this is the claim but rather if you condone one "deviant" behavior because it is between consenting adults, why not others?
Myself, I never cared one way or the other about homosexuals I despise however the political activities they engage and the undermining of my values.