Lgbt actually benefits survival of a tribe and reduces competition within the tribe for mates which could disrupt the unity of the tribe.

I think the numbers end up being about 5-10% of all mammals show homosexual tendancies/behaviour. As far as the other parts of the non-hetero community it's a bit tough to show that in animals you can communicate with.

Lots of things that don't seem to benefit survival show up in the evolutionary tree of life, so who knows really.

Nobody knows why homosexuality is part of all mammalian life, even some birds too I think.

It's also pretty juvenile to think of it as "beating" it.

It's too simple to say "only traits that help survival persist." We have vestigial parts in our bodies, we occasionally bite our tongues, and succumb to genetic diseases.

All natural selection means is that a certain setup is generally good enough to reproduce. So if you remember that "B" and "T" in the initialism there don't necessarily mean same-sex relationships only, they would be able to pass on their genes just fine.

As for others, maybe they don't. Look at the straight people who keep having gay babies. :P

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Gays aren't infertile, and straight couples can produce gay children.

Natural Selection reinforced it, that's why it exists.

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One way to look at it: humans pretty much always form a social group. All over the world, people gather together for the common good: for mutual defense, to support people with specialized skills (you wouldn't want to waste a cook's time with farming, and vice-versa).

Having lgbtq+ people in your family is a create way to have additional adults (who can do lots of things) without the burden of additional children. Hence, any group that welcomes their lgbtq+ family will be a stronger group.