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divebuddy - //If (say) your usually nice husband gets drunk a lot and beats you up. It's not the nice guy doing it is it, it's the bad guy. Actually it's just your husband who is doing it. Because that is what he is like.//
I think the point ummm is trying to make is that some external influences, including addictions and mental illness, can make us behave in a way we would never normally do - but give in to the potential bad behaviour that lives in all of us.
Those behaviours would never normally see the light in a single lifetime, but the effects of some mental processes can bring them out. Equally, as ummmm advises, the elimination of these processes means that the bad behaviour is under a level of control where we never even think of it.
But to assume that someone who behaves badly is simply a bad person is an over-simplification in my view. The majority of people who behave out of character do so because of forces they have not encountered before, and they are unable initially to deal with them.