So because it's hard to be ethical we shouldn't try? Because it is hard to quantify greed it is no longer a bad thing? Because other people are doing it too is

So because it's hard to be ethical we shouldn't try? Because it is hard to quantify greed it is no longer a bad thing? Because other people are doing it too is a good justification? I recently watched the movie "Django Rising" and the character of Leonardi diCaprio troubled me greatly. Not because I thought he was really evil but because I thought he really wasn't. Had I been born in that time, son of a slave owner who was son of a slave owner, brought up surrounded by the values of that time, would I have been able to recognize that slavery was evil, would I have had the courage to do anything about it? Would I have behaved any differently from how Leo's character behaved?