So...you got a better idea?...Just let 'em reproduce over and over?...These dead-beats are nothing but scum.
I personally know of a 74 year old man, who still has to work as a security guard in order to pay his back support....He fathered many kids...and he'll be paying thru the nose until he croaks....And since he's at least trying to pay what is owed...his kids come around once in a while, which does make him happy...otherwise, they would not have anything to do with him.