If you ever been poor, you don’t understand the stress that money puts on a relationship. And that’s just to start with. Poverty also increases stress which increases a likeliness to use drugs to combat the stress. Also, as other people pointed out, it’s most times more economic feasible for people in poverty not to get married because they would be penalized by getting married.

Poverty causes stress and stress causes aberrant behavior.

I might qualify this to say that poverty without spirituality causes fatherlessness.