When I was younger I assumed I would have them. Even dated someone I assumed I would have them with. Then it was something I thought more and more about. The more I thought about it, the less I could justify it. I spent my maternal instinct looking after people with disabilities instead. For me the difference is between a well thought out argument, and one that just goes "oh it's human nature". Which to me is just BS. If people have thought about it, and for whatever reasons can't adopt or foster, then that's different. But just to have them without thought because it's "evolutionary instinct" is foolish and ends up hurting the planet.

When people I know breed I compliment them on their parenting skills, I'm glad I know people who are good parents. But I never congratulate anyone on getting pregnant.