Well, I'm glad that you don't approve of denying homosexuals human rights or treating them with disrespect.
As to your view of homosexuality, we'll have to agree to disagree, I think. I agree there are people who, because it is increasingly accepted, might have homosexual experiences where once it might not even have occurred to them. I also agree that being who we are, people who are isolated from members of the opposite sex might turn for sexual fulfilment to someone of their own sex, even though that isn't their preference. There are also people, jaded with experiences with their own sex, who might turn to homosexual sex for titillation. In adolescence, when sexual identity is more fluid, sexualized feelings can attach themselves to a good friend or a slightly older and admired person. It passes.
I'm not talking about any of that. I'm talking about people who from the earliest awakening of sexual feeling have fantasized only about other men, have only been attracted to other men. I know men like that, have worked with them, have grown to love some as friends. It's who they are...I don't know if you've done any research into the subject, but the science seems to bear it out.
Now, you're right; if the whole world turned to homosexuality, it would be a huge problem for the human race. There's absolutely no chance of that, however; there's nothing to fear. At the most we're talking about a few percent to 10% of men. Even if it were a psychological aberration and not a matter of genetic determination, so long as they are consenting adults, how does it harm you in any way. Why does it so concern you? There's not enough love in the world. There's not enough loving, nurturing sex in the world either. Perhaps if there were, people would be happier. Let them find it where they will so long as nobody is being exploited.
Which brings me to your question about incest. That's usually what people raise, that or bestiality, and I don't think either are good analogies. I think incest has been a taboo for most of human history, and not just because many cultures realized the danger for the survival of the tribe through birth defects and recessive disease. It's also extremely destructive to the family unit, to the kind of protective relationships, relationships based on trust, not exploitation of the young, which are necessary for the survival of the family. Added to all that, I think there may be something primal, maybe hormonal about it, an aversion, an adaptation, which is increased by the amount of time spent in one another's company. There are some studies to that effect.
I recently read an article about a woman whose biological father had abandoned her as a newborn. She met him thirty-five years later for the first time, and she maintains that they fell in love. They started a physical relationship and are still in it. She had herself sterilized. This is a bizarre situation in no way comparable to homosexuality, which, as Maleth pointed out, has been a part of human life from the very beginning. Sometimes it was accepted. Just consider the Indo-European initiation ceremonies, the Greco-Roman world, tribal Afghanistan, some New World Indian societies. Sometimes it has gone into hiding. It has never gone away. If you investigate it, I'm sure you'll find that's the case.
@Bicicleur,
Well, some of the most beautiful love poetry in the world was written by Sappho, who was a Lesbian.
"You came and I was longing for you,
You cooled a heart burning with desire."
"
[SIZE=-1]Please[/SIZE]
[SIZE=-1]Come back to me, Gongyla, here tonight,
You, my rose, with your Lydian lyre.
There hovers forever around you delight:
A beauty desired.[/SIZE]
[SIZE=-1]Even your garment plunders my eyes.
I am enchanted: I who once
Complained to the Cyprus-born goddess,
Whom I now beseech[/SIZE]
[SIZE=-1]Never to let this lose me grace
But rather bring you back to me:
Amongst all mortal women the one
I most wish to see."
Women couples have just been able to hide in plain sight.[/SIZE]