I think everybody should play tribal wars.
Imagine a world without religion and God. Imagine a world without morality? Obviously most of us are not crazy enough to insist that we have to follow religious dogma even on games.
How things would be?
Well, MMO like tribal wars teach us that.
It turns out, morality evolve by it self. It’s quite difference than normal morality we are used to. But again, somehow it’s closer to the reality.
For example, if you get beaten up by some people in tribal wars, you are the “bad guy” for being weak. Other tribe will refuse your entry.