Earlier quoted context omitted.
There’s an entire generation of mostly childless adults who are shocked to find they enjoy contributing to others’ happiness. I have friends like this, their only purpose in life is to have no responsibilities, FIRE, and never give to anyone but themselves. Seems like a terribly depressing way to live but pretty common in tech/upper middle class circles.
It's always funny how many people think that the only font of altruism is taking care of children who have your DNA , like that's some kind of selfless act. It is, in fact, the ultimate vanity of which humans are capable. Raising little variations of yourself might make you feel good, but if you think it's a unique path to a fulfilling life I suggest you are the one in the little bubble.
This is a strawman position in my opinion. I don't think there's that many people who think they're carrying out some selfless act by having children. It's simply biologically true that the children you'll probably have the easiest time raising are your own and, assuming we want to continue as a species, we do need people to have children. It's fine to have them, fine to not, neither side has some moral high ground.