Or, perhaps what they have in common is an irresponsible, “can’t be bothered with kids”, low values, father, who abandoned all of his sons and daughters, did not pay child support, and left their mother to do the work of both parents, in addition to struggling to keep them fed and a roof over their heads.
It could go either way, IMHO.
I agree with you that it’s a no good situation, but with school shooters, in particular, it’s frequently the bullied kid who has been demasculinzed.
The no-good father scenario results in lay-abouts, rapists, and no-good fathers, part II.
Neither is good, but they are different beasties.