The party of fiscal responsibility would rather pay for an impoverished kid and mother's food stamps and welfare for 20 years, plus $30k a year to imprison the kid when he likely turns to a life of crime because of his shitty socioeconomic circumstances, plus additional support for the mother when she's not able to get out of poverty because of having to raise a child...
...rather than $30 for a 100 pack of condoms.
They don't want to pay for those other things either. They'd idealistically let them die in the streets without any intervention because that's the way it's supposed to be and others should not be burdened with it. Ironically very Darwinian of them.