Only because you're defining one as normal and the other as abnormal.

It is possible for the human species to exist without cigarette smoke, and doubtless for at least part of our history it did not exist.

It is not possible for the human species (or any form of mortal biological life) to exist without children.

If you want to try to define the latter observation of reality as “abnormal”, fill your boots.

There are lot of holes in your argument:

- civilisation is currently more at risk from overpopulation than depopulation

- just because children need to exist doesn't imply they need to exist in apartment buildings

- just because children exist doesn't imply that they need to play outdoors on balconies

- just because children exist doesn't imply that there can't be limits on how much noise they can make, and when

etc etc

You’re not going to win the “children in society” are abnormal argument. If you don’t like children, leave society.

I remember when I was young and edgy, and thought dunking on parents was simply sharing hard truths.

Boy am I glad I grew out of that mindset.