I maintain that morals are subjective. Any action could be "good" or "evil" depending on the circumstances.

That being said, the causing of pain or taking of life is generally considered "evil." In general, I think it is better to avoid it. However, sometimes it is necessary to harm another. Self-preservation, for example.

Revenge is not always necessary, but it is gratifying. I firmly believe in taking revenge against those who have wronged me. This frame of mind isn't for everybody, but it works for me. When it comes to revenge, I think it is important to have no sympathy for your victim. If you feel sorry for them, then you have no business taking revenge. Revenge is the place for viciousness, not mercy.

I gave up trying to be the "good guy." That isn't to say that I'm "evil," but rather that I don't feel the need to impose moral standards on myself that go against my natural behavior. There's no sense in apologizing for something if I'm just going to do it again.