I'm probably in the super minority, but for years I've been wondering why someone hasn't put forth a proposal requiring reversible birth control for males (once it is perfected) and females.
Once you enter puberty, you automatically get put on some form of birth control. When you are ready to have a child, you go to a doctor and get the BC reversed. Would eliminate most of the accidental and unwanted births.
The only reason I I can come up with why I haven't heard of someone pushing for it would be some sort of constitutional violation, and how against birth control some religions are.

guns? yes
bows? yes
cameras? yes