There's a perception that they're mostly young couples and these young men are not taking their responsibilities as fathers.
There was a time not too long ago that as a young father I felt I was a burden to my family. Employment wasn't available to me, and educational opportunities were not available to me. I felt that being in the house would use up resources--food, heat, water--and that my presence within the home would be a burden to my family. That's one reason why young men aren't there.
Another reason why young men aren't there again is simply the cycle. They didn't grow up with a father in the home. They don't have an understanding of what it takes to be a man or to be a responsible man. I think that's something again that needs to be tackled at an early age and addressed as that person grows up, in order for them to see the relevance of it and the relevance of a father figure within the home.