Why can't the boys have female role models?
Well, if you think about it for five seconds, it's because people in general (but especially children) identify with and look up to people who look like them and share their culture. That's just human nature.
on one hand you are saying boys with female role models do not develop their masculinity and on the other you are saying there is a link between criminal behaviour and single mothers? this criminal behaviour is coming from their feminine side?
It's also not clear to me at all that the person you are responding to is correct about mothering being about pampering or whatever. You could easily ascribe a tendency like that to the higher likelihood for single mothers to also be more stressed or less well off and with less time to invest in doing much more than trying to placate the child in the quickest way possible. Plenty of mothers that don't pamper and fathers that do, so that claim needs a citation I would think.
The word they were looking for is "coddle".