Quite frankly, I'm not sure how "horrific", especially in certain areas, that a thing like a "1 child law" really is. The way they enforce it is pretty heartless, even if your 1 child dies you cannot have another. That's fucked up.
But on the flip side of that, I honestly feel that there should be a law restricting the number of children a couple can have. I know that's "infringing on your rights", but at the same time, overpopulation and lack of resources IS a growing concern. I don't think it's morally or intellectually responsible of ANYONE these days, no matter where they live, even America, to be having more than 4 children, and quite frankly even 4 is pushing it. These families that have 6, 7, 8+ children, I think that is honestly contemptible in this day and age. This isn't the fucking stone age where half your children die before they reach adulthood. There really is no good excuse or cause to have so many kids, other than you "want to". And considering the problems we face as a race/planet, I don't think it's morally right to have lots of children.
So in that case, I think having a legal cap on the number of children anyone can have, is something we as a worldwide species are going to have to look into. Seriously.
But as for the "gay being part of evolution" thing....that is a sticky subject. It's one I've thought of myself. I am not a Christian/Jew/Muslim by any means. I support gay rights, not because it's a top issue for me, but because I believe in equal rights for all, and stopping gays from getting "married" instead of "civil unioned", is childish. Let them marry if they want, have the same couples rights, etc. But, I do also believe that homosexuality isn't "natural", either. Meaning, nature created humans, as all mammals, and most reptiles/amphibians/birds/fish/etc. as well, to be male/female. Two sexes, intended for mating. So in THAT sense, in a purely scientific sense, being gay is not "natural", because we were intended to be attracted to the opposite sex. To pair off, to mate, to procreate our species.
But I've pondered what you bring up before. I have wondered to myself if people being "born gay" isn't some kind of aberrational reaction to human overpopulation. Mind you, I'm ignoring semantics here. But for any overly sensitive persons reading who might get their shit in a twist, no, I am not one of those that believes being gay makes you "evil". Not at all. I just said it's unnatural. But it is a fair point to at least ponder, has human civilization caused homosexuality to pop up more now than in past history, as a means to try and curb population. Like I said, it's a very sticky subject, which a lot of people don't even like to hear talked about, either because they get overly sensitive about people talking about the cause/origins of homosexuality, and then the overly religious folks that don't want to talk about it because "it's a sin".
BUT, it is an increasingly prominent minority in society, it is something that deserves to be studied and researched. There is, to my knowledge, as yet any real scientific data on homosexuality, what causes it, how people are "born gay", what are the factors, etc. Certainly nothing like a "gay gene" or anyting definitive like that discovered. It would be very interesting to have people look further into the subject.