Mutilating someone's vocal cords isn't evil?
I'm surprised his karma is neutral.
The impression I had from Dean was that some of his actions are evil, while he himself is not. He is extremely insecure. He felt like he was standing in Sinclair's shadow, and let that control his life.
Keep in mind he has been waiting and planning in the Villa for 200 years. That's how important it is to him, and he is willing to do anything to get back at Sinclair while Sinclair hasn't even explicitly done anything to Dean, and will never even know what happens in the casino. It's very sad, really. Cutting Christine's vocal cords, planting a shaped charge in a cushion just in case someone like the Courier came along, trying to kill the Courier when he's afraid the Courier might betray him.
It all seems evil, and is to a certain extent, but he is so consumed by his envy and insecurity that he does these things despite his fair nature. It's really sad, and if anyone should have a chance to 'let go' and 'begin again', it's Dean. That's how I feel anyway.