So ... because existing protections are incomplete all protections should be discarded? I'd say that's the logic of a tantrumming 3YO: It's not FAI----AIR!. Except that would be an insult to tantrumming 3YOs.
But I'll give this gay DU member 3/4 of a kudo for consistency in his/her egoism. If homosexuality is OK - not sure how they square that with their probable belief in materialistic Evolution - then why not incest, polygamy & polyandry, pedophilia, and bestiality.
That's a mixed bag, biologically speaking.
Homosexuality is a biological dead end- homos don't pass on the imaginary 'gay genes'.
Polygyny and polyandry would promote genetic diversity,
Pedophilia (sex with prepubescent children) and bestiality would have no effect, from a strictly genetic view.
'Incest' is a legal term, not a biological one, so it can't be pigeonholed into a single genetic category.