I agree, and in addition, the probability of incest is much higher for heterosexuals than homosexuals since the probability of two homosexual family members is

I agree, and in addition, the probability of incest is much higher for heterosexuals than homosexuals since the probability of two homosexual family members is much much smaller. In other words, when and if support for legalising incest arises, it will most likely be by heterosexuals, not the LGBT community.