Born out of frustration and the desire to be heard, this feeling is not just the burden of the one who is angry, for it is fed by social neglect.
Anger can be the source of strength and motivation, particularly for people who's world view is centred around the sense and view of self. But for those seeking motivation and direction from without it can be a slow poison -- in their unconscious mind it is a constant reminder of an unresolved conflict.
Well said @eccles