That mix, though, isn't going to balance near the middle. How many old ladies saved = beating a dog to death? If I throw in some food for the homeless is it too much good? There's no way to know the weight of moral or immoral acts. The mixed good and evil behaviors will lean one way or the other. There's just no way that they can be intentionally or even accidentally balanced. It's the same with law and chaos.
Neutral is, "I don't believe in murdering people, but I'm not going to risk my life to help someone being murdered. It's not my business to tell the cops what I saw. They can figure it out on their own." and "I'm not going to go out of my way to break the law, but I don't really care if it happens." They have beliefs, but their convictions are not strong enough to shift them towards law, chaos, good or evil.