Is it selfish to choose not to have kids?

Fine, it's your life and your body, I'm not disputing that. But somebody has to drive the ambulance, staff the nursing home, and pay the taxes that keep the lights on when you're eighty-five and childless, and that somebody is going to be someone else's kid. We're already down to about 2.8 workers per Social Security beneficiary, heading toward 2.3 within a decade (Trustees Report). The modern childfree argument wants the autonomy without the invoice: all the freedom of opting out, none of the reckoning with who covers the gap. I don't think that makes anyone a villain. I do think it's, by the plain dictionary meaning of the word, a decision that prioritizes your comfort over the shared project, which is what selfish means. Own it and we have nothing to argue about.