the weird thing about Whatever Happened to Monday is it posits a world in which Europe has an overly high birthrate and the bad guys – right-wing Aryan fascist types – are trying to bring down that birthrate and when these Nazis are overthrown it is finally safe for white people to breed again
bit of a confused premise, really
the other weird thing is it considers the horrifying implications of a world in which a government institutes a One-Child Policy, a far-fetched dystopian idea which has actually already been implemented and still exists in modified form.