Anyway, it's interesting to see this same story of Nice Guy and shadow played out, years before Fight Club, which is my favorite film and the convergence of those two topics.
As always, we find in the end that either half of the duality isn't very healthy, and that the royal road out is integration. There is nothing wrong with being nice, nothing unhealthy about knowing how to please people or wanting to have good relationships. But when it's reflexive and not a conscious choice anymore, then we are in trouble. The answer isn't going all the way to the other side of the spectrum and becoming a jerk - it's about balance.