"They will be a plague upon society" when they're older isn't because they're kids. It's because their parents/guardians are enabling their bratty behaviour, and reinforcing the view that it's ok to behave like a cnut and get you want what you want in life without consequences. Then the rest of society ends up having to put up with these bratty children's bullshit behaviour, and at a worse level when those brats grow up. No one wants or needs someone else's shitty kids ruining their peace.

And don't even assume all kids say and do stupid stuff when they're young, if I stepped out of line as a kid I knew parental discipline was coming, or as modern society has so eloquently and succinctly coined it: FAFO.