"Having kids is a selfish hobby"
What a ridiculous statement.
Having your own kids is promoting your own genes. That is selfish. If you adopt = care for a human not sharing your genes, then it looks different. But when people talk about the "altruism" of having kids, it's not any kids. Oh no. It is their kids, their genetic offspring. That is selfish.
Adopted kids is more similar to caring for a pet or plant so another living being with which you do not share that many genes. However, still a hobby in the sense of unnecessary, elective activity. The same as our audio hobby. Unnecessary and elective.
Please enjoy your hobbies, but don't make me pay for yours. And that is the case where child-free people subsidize breeders. And let's not even start with the perversity of IVF, when the world is overpopulated by about 170%, the US by around 200%, see global footprint network. Fortunately birthrates are going down, but population is still not shrinking overall.

