The ultimate root is broken families, which welfare, along with feminism, was meant to promote. Once you take the father out of the household, you take the discipline out of many of them. Boys are a lot less likely to listen to their moms than dads, especially as they start getting into their teens. At that age, they get to the point where they start scaring their moms and these boys will look for 'male guidance', which leaves an open door for older, predatory males to utilize them as crash dummies and foot soldiers.