[jimbob45]

I think it's better to ask why should population keep growing? We don't need it and it physically has to stop growing at some point.

Because you can’t stop people from breeding apart from killing them, at which point you’ve become Hitler. That or tax and social disincentivization at which point you’ve become the Illuminati. That or a procreation suppression field at which point you’re the Combine.

[mytailorisrich]

That's obviously no true since (1) many countries today have birth rates below replacement levels, and (2) contraception exists.

(Godwin point reached very quickly...)