Very good points LeBrok, but what about Scientists start dealing with the situation as instead of something 'going wrong' as what is nature intent for its work?
I think the argument can be made that the goal of every organism is to have offspring. In this case homosexuality can be viewed as evolutionary dead end, some sort of genetic affliction. However a different point can be made in context of whole human species. Humans are group animals therefore future of the whole group (a group viewed as one unit) is more important than future of one individual. After all we are all descendents of strongest groups. Number and quality of offspring can be a measure of success of entire group, regardless which individuals contributed genes. In this line of understanding people who can't have kids (homosexuals included) are contributing to the success of the group and its offspring, by paying taxes, producing goods or fostering orphans, and many other ways.
A parallel could be made to other social animals like ants. Regardless of a fact that most of them can't reproduce they exist for millions of years, they are very successful species. The genome of the whole group (viewed like one organism) is what matters at the end.
If someone thinks it is far fetched proposition, think again. If we go back 6 generation we ending up with 64 grandparents (64 different people) contributing to our DNA. If someone comes from small village all people in it are pretty much third cousins. It means that the entire genetic code is nicely mixed together, and with deep autosomal tests they all can be traced to one geographical location, that's how close genetically they are to each other. From village point of view it doesn't matter who in the village procreates, the kids will have pretty much same DNA anyway. Unless someone introduced mutations or a stranger settles in the village, but that's a different story.
This is how I see it in light of evolution and natural selection. Not necessarily what I feel it should be.
But that's life.
Homosexuality is not like Cancer, or a debilitating human physical condition. Why don't people focus on the good side of homosexuals. They have great attributes to art design and fashion, and much more. Is it possible that the behavior is somewhat coherent for a society (as nature intended as also found in the animal kingdom) rather the dying black and white psyche but still very evident today?
All habits die slowly. When I look at young generation here in Canada, they are so open, tolerant, inclusive towards people of colour or different sexual orientation, or even foods and customs. This is how they were educated, in spirit that we are all Canadians, and equal people, all belong to one group.