Some PMAs enforce this by giving tax breaks to people who follow their guidelines, and fine people who do not. Others execute the child. Still others execute the parents. But on the whole the more lenient worlds with planet management authorities seem benign. Life is clean.
Every person has a voice.
Perhaps things are not so beautiful on the inside as they seem on the outside. But little else. Crime is common. Happiness is not. The less conventional Earths are far more interesting, or at least shocking.