Why would a woman settle for being a baby mama?

I understand that accidents happen, and I am not talking about that. I am talking about those who choose to get pregnant by a loser. I am talking about dating the guy who is already a deadbeat dad or shown commitment phobia with one chick, expecting different results. If I am going to have a kid , I am going to be married to a man that will mAke a good father and husband. Some women know these men are losers, (intution, and his sketchy past) but they still lay with the dude. Why would you want to be a baby mama chasing a dude down for child support? Please explain!!!