i wouldn't say it's that ridiculous. morality is pretty arbitrary, when you think about it. most things that we'd automatically categorize as "wrong" have exceptions that make them less so. some things we'd categorize as "right" may have consequences or motivations that are less so. and in time, our definitions for both change back and forth.
i believe in right and wrong, in good and evil, but i don't think they're as easily defined or defineable as most would like or believe them to be.
personally, i don't see how anyone can be happy living in absolutes of black and white. it's the complexity, the contrast, the intertwining of the two that gives anything meaning.