I'm intrigued by the common and immediate assumption that if a grown adult behaves badly, they must have had bad parents. I can understand why someone might believe that about a child--even though all children sometimes misbehave. But while our upbringings do affect us a great deal in adult life, we can consciously choose to be better or worse than how we were raised. The assumption that shitty behavior is always an outgrowth of shitty parents offers a sense of control. It placates us into believing that as long as we are good, we'll raise good people. That line of thinking is interesting if you follow it into a family timeline. According to its internal logic, a person is bad or good because of their parents--and their parents would have learned those habits from their own parents in turn. So nobody is fully accountable for their actions, but they are fully accountable for the actions of others.