i dont think having children is the key to happiness. it really depends on their Standards, but if u really wanted a child u could always adopt one.
So aside from the fact I think it's a little odd you like to read about lgbt couples but don't support them, you're reading Japanese manga's, Japan has very tough laws and gay couples can't (or at least couldn't) adopt. In western Europe and USA lgbt couples can marry, have kids and do so. And it's quite possible things will become like that in Asia too. If people support lgbt people then things will become better for them, when people don't care they won't. So if you want to make things better for them support them.
Like Anon said, I also don't understand how you read and like mangas about gay people liking each others and having sex but don't support them... lol
If more people supported lgbt, things could become better and life easier for them.
Supporting lgbt doesn't mean you have to give them money or stuff like that, it means you support others to be free of liking who they want(same sex) and being who they are and having the same equal rights as you a straight person.
I agree with miu about having children not necessarily equal to being happy. Even some straight couples nowadays opt not to have kids. This is something that only the couples themselves can decide. If the gay couples'd like to have kids of their own, then depending on the laws of their country, they may adopt one or wait for the laws to change (sadly).
Im really crying right now after read tamayura and life senjou no bokura. I began thingking abt how lonely lgbt couple bcs they cant hv children. I began pity all of couple who cant hv children. Its u know somehow its lonely to see them just life with just 2 of them. When i think abt it, really isn't it too lonely for them. Is their line of life just end like that? I really know when its come like that they will mention like something abt another life. I really began to cry when i rhink is they really happy in their another life. Seriously too see they shunned in this real life idk anymore. I really want to convenience myself they life happily even tough they dont hv kids. God, its suffocating. I dont think i support lgbt but i dont prejudice about it either. I just want really honestly ask. If one of us like that, is u doing your life happily ? Im really glad if u dont regret and live the life the way u want.