Some do it for money. They game the system, use the children for income from welfare. I know a few that make over 100,000 a year doing that. (I actually know them), Others are just irresponsible and have casual sex without protection of any kind and end up pregnant. Still others have them in hopes of trapping someone into marrying them. Still others are just mental cases.
They don't know any better and its a cliche but were often abused themselves.
How else are they going to qualify for welfare and tax breaks?
we weren't wanted.. i'm kinda glad i wasn't put up for adoption though.