Why is it always considered a man’s fault when a male child grows up to be violent or a criminal?

If a single mother raises a son and he becomes violent or criminal, people blame the absence of a male role model. But if a boy is raised by both parents and still turns out violent or criminal, people blame the father for “not teaching him properly.” How can it be the father’s fault when the child was raised solely by a single mother and therefore couldn’t have been taught “toxic masculinity” by him? And in both situations — single mother or two-parent household — why isn’t the mother also seen as responsible for teaching her son the right behaviour?
Why is it always considered a man’s fault when a male child grows up to be violent or a criminal?
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