Why would anyone choose to have sex with the same gender in places where they can be killed just because of that? Why homosexuality exists in more than 1500 animal species?

Scientific evidence shows that the sexual orientation is likely predetermined during gestation, so it cannot be a decision.

Nobody forces you to have sex with people of your own gender, and I think you should not worry about who other people have sex with.

Humanity cannot produce and distribute enough food for everyone, and this issue will be more and more important as population grows and natural resources gets exhausted. Homosexuality decreases population growth so it has a positive effect. Homosexuality could be a natural mechanism for preventing overpopulation.