JoshM: "An 'right' intention always has the ability to lower entropy, but does not guarantee entropy reduction, depending on the action taken.
A "non-right" intention never has the ability to lower entropy, no matter what action is taken."
I think you have basically the right idea in regards to intent and entropy reduction. I would argue, however, that a right intention refelcting a high quality consciousness would always provide entropy reduction even if the actions don't produce positive results. For instance, if your intent is to help someone or teach them a valuable lesson then the intent is the measure of your progress, not whether or not the desired outcome is achieved.
If, however, the intent to do good resides in the person but no action is taken then the intent wasn't strong enough and no entropy reduction is obtained. They might be on the right path to eventually obtain the desired results but aren't quite there yet.
If a person is merely justifying the things they do by saying "Well, my intentions were in the right place." when in fact they aren't then this is merely ego-delusion. Thinking you are a better person than you actually are isn't productive at all. As Tom says, you have to taste the pudding occasionally and decide if your relationships with others are governed more by love or by the ego. Self-appraisal can be the easiest thing to do (if you have reduced fear and ego) and the hardest thing to do (if ego and fear cloud your judgment.)