If our Designer chose to create--for whatever reasons we might theorize--hundreds of "unnecessary" varieties of birds, butterflies, fish, flowers and faces with a dozen different eye colors, isn't it conceivable that same Designer also created a few varieties of human sexual attraction?
Only 8% of the global population have blue eyes but no one views that as a sickness to be healed or prevented--in fact their rarity makes them all the more appreciated and valued.
I get your point, but what bothers me about this is that you make it sound as if the difference between homosexuals and heterosexuals is completely trivial, which is just another way of saying "they aren't really different". This seems to be one of the lefty contradictions - aren't we supposed to celebrate diversity, i.e. difference? But at the same time, they say "we are all the same!". You can't have it both ways, it seems to me.
So, having established that the difference between homos and heteros is much, much bigger than let's say the difference between blue-eyed and brown-eyed folks, the question is - are those who are the norm "better"? Well, how about: all there is is lessons, and each one of us came here to experience different challenges?
In that view, new possibilities open up. For example, it's hard to deny that gays are on average much more promiscuous and fixated on sex in general. Perhaps many of them came here to learn how to get a grip on that? And maybe in past times, men who (like cyre said) are attracted to men but sometimes also to women, simply would have married one of the women they feel attracted to and decided against expressing their homosexual urges? What's so bad about this? I'm sure there were quite a few awesome gay dads and husbands back then. Or bachelors who didn't express their sexuality at all but focused on other things.
But of course, liberals are completely horrified about such ideas. They tend to glorify sex and think sexual expression is a road to liberation. Newsflash: sex isn't everything in life, far from it in fact. What a concept! And we all, gay or not, have to control our sexual urges, express them responsibly, and often consciously decide not to express them. Maybe it's just that this can be harder for gays. But well, each one of us has issues to deal with. Here's another great challenge that can lead to growth!
I'm not saying that we should go back to criminalizing homosexuality or anything like that. But as always, the picture is more complex than "good" vs. "bad". And a sense of entitlement, lack of external consideration, and hypersexuality have never helped anybody progress, whatever acts of sexuality they fancy.