If sons turn violent, dads get blamed—yet if no dad is present, dads still get blamed. Why not the single mother?

I mean that when a father is present and a son turns violent, people say it’s because the dad didn’t teach him right. But if a son is raised by a single mother and turns violent, people still blame men for not being there—when logically, if no man was present, he couldn’t have influenced the son’s behavior
If sons turn violent, dads get blamed—yet if no dad is present, dads still get blamed. Why not the single mother?
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