Here is a government study showing a markedly higher risk for perpetrating violent crime among children who were abused or neglected by their parents. So that's one effect. Bad parenting leads to bad outcomes.
Here is a different study which says:
...The role of parenting in the development of criminal behavior has been the source of a vast amount of research, with the majority of studies detecting statistically significant associations between dimensions of parenting and measures of criminal involvement. An emerging group of scholars, however, has drawn attention to the methodological limitations—mainly genetic confounding—of the parental socialization literature. The current study addressed this limitation by analyzing a sample of adoptees to assess the associat
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