Well, I think.... what OP is trying to say is..... its easy to do the right thing if the situation is black and white. And perhaps a bit less telling.

What about some morally grey situations like.... are you willing to lie for the greater good for example? How much of a lie for how much greater good right?

The way I interpret your response is that your most defining traits are already divided up between the two (or multiple) or whatever sides and.... that's okay. I think we all try to do this; honestly. I just think OPs point is interesting because I feel sometimes situations DO come up that make you wonder, what IS the right choice, or which choice do you even want.

Um.... just a random example that popped into my head.
Uhhh.... You're walking down the street, and see uhh I don't know.... $10 on the ground. The pair walking ahead of you are about a half block down. You'd REALLY have to yell to return it to them even if it was theirs. On the other hand, there is a homeless man in an alley that has his eyes on the area of the street where the money lays, but has made no motion to get up as you're much closer. What do you do?

If the answer is still obvious to you, change the distance of the homeless man, or the pair who possibly dropped it, or the amount. ;)