It exists because people are constantly flooded by a torrent of pressure to have children by society, and this is a place for a little catharsis and relief. Relief that there are a small number of people that won't pressure you into doing something you don't want to do. It's a place for like-minded people to blow off steam.

I don't personally come to this or similar communities, even though I don't plan on having kids. I understand why it exists though.

Why do you go into other communities to complain about someone’s posts? An entire condescending post dedicated to complaining about something that has zero effect on your life - why bother? You could just ignore it, or even downvote it, and then just move on.

Having or not having children is a significant life decision. Maybe people want to talk about it? That’s why this community exists.

Why do communities exist for - to pick an example - atheists? In lots of parts of the world, there is huge social pressure to conform to a specific religion. If you decide not to, or leave the religion, or have questions, it can be a terrifying and lonely experience.

It's the same here. Lots of us feel huge pressure from family, friends, co-workers, and society to do something that we don't want to do. So it is nice to have a community where we can discuss that and reassure each other. Because it is difficult to do what is right when everyone is telling you you're wrong.