There are some great, balanced answers already, so I can't add much.
I personally find that projecting positive energy generates better results for me.
My dreams often reflect my own feelings. I think most people find this to be true in some ways at least, eg. feeling confident about your lucid powers/abilities will increase your success rate much more than if you're feeling doubtful.
So by this logic, actions that you feel morally comfortable with will probably result in more positive outcomes than morally questionable activities.
Even in situations where DCs are being hostile, I find that remaining friendly and showing them love/empathy usually works much better than trying to fight back. They soon start to reflect my energy, and often become helpful companions.