"Don't ever compare heterosexual incest to homosexuality! Homosexuality is much worse because it involves two people with the same genitalia!"
So? As Thomas Jefferson would say (emphasis added):
'But it does me no injury for my neighbour to say there are twenty gods or no God. It neither picks my pocket nor breaks my leg.'
And to reiterate - and paraphrase - what he'd say (certainly if he were alive today):
But it does me no injury for my neighbours to do what they - as consenting adults - do, regardless if they're of the same gender. It neither picks my pocket nor breaks my leg.
Tl;dr: As a straight man, I have no problem with LGBT people whatsoever. So why the fuck should you?
"At least incest can be traditional, and involve a man and a woman--a brother and a sister, Just like the children of Adam & Eve! So wonderful and pure of heart! God bless."
Well, if you & your fundie ilk want to be ugly fucker subhuman mutants, you go right ahead:
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Just don't pollute the rest of the very diverse gene pool, that's all.
PROTIP: The Amish. With the inbreeding happening in that small gene pool (after all, who wants to join them voluntarily?!), genetic mutations are already appearing: anaemia, dwarfism, even Down's Syndrome. Later, more pronounced mutations will occur, and not just physiological/aesthetic ones, neither; sterility will set in too. The Amish will ultimately become extinct.