[jondubois]

Yeah but if none of us had this construct of 'good' or 'evil', we wouldn't be able to co-operate. We would all be killing each other to get resources - Physical strength and brutality would become the most important evolutionary traits.

I almost certainly would not be able to exist in such a world - So my existence (and that of millions of people like me) relies on the fact that people believe in 'good' and 'evil'. So I support the notion.

That said, the notion of 'good' and 'evil' doesn't have to be homogeneous throughout society. In our current economic environment, it pays to be slightly evil because it lets you take advantage of people who are less evil than you. If you can do 'evil' things but manage to deceive people into believing that what you're doing is actually 'good' - Then you have a huge evolutionary advantage.

I think hypocrisy is a huge evolutionary advantage as well.