I don't buy it. Good and Evil is based on how you look at it. For example, I find someone doing evil for a greater good isn't wrong. About the cycle, it's actually pretty much natural. The predator who preys on a prey will get eaten by a greater predator. And this greater predator will get eaten by another greater one. This list goes on and on... Kill or be killed, It's the same concept, but I guess you can call it " civilized ".