Comment by jacobgkau
You simply don't understand math if you think that every couple (or even most couples, in practice) having only a single child is sustainable to infinity. You are the only person here who brought up the 3 number; 2 on average is (very obviously) all that's needed to sustain a population, and you chose a higher number (and applied it to the individual instead of as an average) to make the argument look unreasonable.
Also, your assertion that "eventually most do" have at least one kid is already close to statistically false in the US, and if current trends continue, will be false very soon (with the story being the same, or much worse, in all other first-world countries). Go check out /r/ChildFree on Reddit if you want to see just one of the many social movements surrounding this.
You’re correct, it’s not sustainable. But that also means the OP thinks anyone who doesn’t contribute to sustainable model (>=3 children) is an awful person.
Well, 2 is not sustainable on average right now, because we’re below replacement level, so we need to get the average up to like 3, then back down to 2.1 if we want somewhat same amount of people like right now.
Either way, judging people with their ability, want, or need to have children is kinda stupid. I have dear friends who are single, couples with no kids, couples with multiple kids and etc. Actively saying one choice is bad is the reason why some people might actually not want to be around those people. Let people make their own choices, and what they think is right to them.
Again, I’m saying this as a person who is planning to have children.