I think it is unfortunate when therapists qualify different behaviors and feelings as good or bad, wanted or unwanted, suggesting that some elements of us are dark or like an evil shadow. I think people develop these kinds of perceptions about themselves exactly because they were told early on that some parts and motivations are unwanted and need to be suppressed, isolated etc. I think this is what often creates a sense of fragmented self in the first place and sometimes Ts cultivate it further.

I also think that we don't need to act on our feelings, but never voicing them is not good either. Maybe the thing is to learn to resist momentary impulses and express negative stuff in meaningful ways that can be discussed and used in problem solving.