What are you talking about? Gay people want to and indeed do: marry all the time. It's the government that oftentimes makes such an act illegal and fails to gives the privileges of a lawful union that straight people are given without any issue. Gay people also want to raise children - to put plainly: they just want to pursue a happy life like anyone else.
The government MUST accept it, it s the ONLY value of marriage: it is not an "act", it s a legal contract.
Ofc it s stupid not to make it happen, and it has been a long combat. Most of humanity doesnt allow it yet, and maybe from the comfort of where you type from, it's done and away, but here in China, it an exhausting fight.
What were you finding so strange in saying it was a long combat ? I see 100 years at least before it happens here.
If you're saying it's government and culture (and many religions) that are against gay people marrying, I agree with that.