Circus it is :-). I don't care whether this lady has kids, but complaints about overpopulation are based on the idea that other people are less valuable than Herself.
Not to mention the vast majority of "overpopulation" whiners live in big cities. Unable to see past the ends of their collective noses, they believe the whole world looks exactly like the view outside their studio apartment windows--and we all end up hearing the moaning and kavetching!