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In social organisms such as bees, most members of their communities do not breed. What reproduces itself is the hive. Humans are not such an extreme case as honeybees, but there is a degree of group-level selection taking place. There must be a lot of human types that play unrecognized but possibly indispensable roles in the well being of their communities, perhaps including gays along with Nietzschean overmen, religious recluses, thuggish skins, autistic nerds, bipolar artists, and brilliant strategists.
If this is the case, then enforced conformity is detrimental to the survival of the folk.
Gays are thrown (in Heidegger's sense) into absurd and impossible situations and so must improvise. Although some of the results of that improvisation have been for the worse (1970s orgies amplifying the impact of sexually transmitted diseases), much of it has added to overall cultural flexibility, vitality, and strength.