One of the endless stream of contradictions streaming from the left is the concept of mandatory child support. It's enforced, and usually the money is directly debited from the nuncustodial father's paycheck. This leads, in effect, to many fathers taking under the table work or skipping between jobs before a court order can be obtained to garnish their current wages.
But most importantly, when it is taken against the will of the noncustodial father, it represents a glaring contradiction. Because court rulings have consistently ruled that a fetus is a part of the mother's body, and represents a "choice", the mother's "choice" should come with willingness to absorb the entire cost of raising the child to adulthood. The mandatory child support laws give her a gun to hold to her ex husband or boyfriend's head for the next 18 or so years.
It would be entirely different if the father had a say in whether or not the mother was to have an abortion. Then HE should foot the bill if he chose to keep the baby. But because the choice to keep or abort belongs entirely to the mother, so do the consequences of her decision.