More generally: Having children costs something, because it requires work input. Who pays for the children? The men, women, families, their employers, the state (=also people who don't have children)?
Possibly a necessary means to end (if you believe in this kind of logic) but hopefully not an end in and of itself.
(Already got enough minus points for pointing out gender issues and advocating free education so may as well dig myself even deeper :) )
Car insurance isn't compulsory in all states (assuming you are from the US, but most require it). In NH you simple have to prove the ability to provide personal responsibility. If the roads were private, then it should be up to the owner of the road whether or not insurance is required.