Sadism is not an infectious disease that strikes a person all of a sudden. It has a long prehistory in childhood and always originates in the desperate fantasies of a child who is searching for a way out of a hopeless situation.
If it's very painful for you to criticize your friends - you're safe in doing it. But if you take the slightest pleasure in it, that's the time to hold your tongue.
The results of any traumatic experience, such as abuse, can only be resolved by experiencing, articulating, and judging every facet of the original experience within a process of careful therapeutic disclosure.
Regression to the stage of early infancy is not a suitable method in and of itself. Such a regression can only be effective if it happens in the natural course of therapy and if the client is able to maintain adult consciousness at the same time.
Edward M. Lerner