how does capote's writing develop dicks psychological state of mind?

I think we are lead to believe that Dick is an evil guy, a hardened criminal. We hear about his sexual conquests and prowess on the basketball court. At the same time we also see a vulnerable self-aware side to him. He understands his perversions and is ashamed of them. He knows his motives for going to the Cutter house were not just money but for girls. Capote paints him as a tortured man who can't or won't control his impulses and hates himself for it.