I have seen many men and boys raised in two parent homes and become non or less productive in society as men raised in 1 parent homes.
Not only is my sons father one example, but so is my father. He was raised in a two parent home, yet has three different kids by three different women, and didn't really come into my life until age 4 and my sisters at age 13, and thats based on week-end visits. If it had not been for the 8 years between my lil brother and us, he might not have been around as much for him either.