Back when Margaret Sanger founded Planned Parenthood, she realized that only the elimination of what she called "the mongrel peoples" would allow her to achieve her statist goals. Her organization was designed with population control in mind and those who didn't measure up were to be 'bred out' of the population. Since then, progressives have done everything they can to pretend she's a saint who wanted nothing more than to further women's reproductive rights but, deep down, their totalitarian instincts still trend toward population control.
These days, of course, it's in the name of a bogus environmental boogeyman. Since we're "destroying the planet," or "overpopulating," they'll suggest that maybe we should think about controlling not just the actions of people, but their existence as well. Most of the time, they only discuss this privately, of camera, and off-the-record