My parents only had 2 children because they could only afford 2 children. If the US government rewarded my parents for having children, they would have the incentive to have more children. Technically it does (through taking advantage of the welfare system) but my parents are hard working immigrants and not freeloaders (not to be confused with people who are on short term welfare due to legitimate unforeseen events). They did not have more kids. Other people aren't so well behaved. Other people purposely have children so they can get welfare.

If the US funded planned parenthood more, legalized abortion in all 50 states (which women already want, see below), turn off welfare for pregnant women who cannot provide for their children but got pregnant anyway, and subsidized contraception to make it affordable beyond excuse, the kids of which you speak would not exist.

I know I sound like a cold android and YES you may call me an asshole but that's life, that's nature.

Every human has a right to reproduce but is responsible for taking care of their offspring. I am not responsible for funding YOUR children's existence. Civilized people already live this way:

"The biggest reasons why women have abortions are: that having a child would interfere with a woman’s education, work or ability to care for dependents (74%); that she could not afford a baby now (73%); and that she did not want to be a single mother or was having relationship problems (48%)." - http://www.guttmacher.org/pubs/journals/3711005.pdf