And this is why you keep people who are too poor/stupid/crazy to raise children from having them in the first place.
You can't legally 'keep them' from doing it, but you can certainly do things to encourage it not to happen, and I agree. Make abortion legal everywhere (and possibly even federally fund abortions), provide proper pregnancy prevention sex education in school, and provide free (not just no deductible) birth control and distribute it at high schools/universities.