Question

what is the good of morality

This site will give you some good ideas about that topic.

http://en.wikipedia.org/wiki/Morality

Morality is a guide; it helps us to decide what is "good" and what is "evil." In other words, it helps us to choose between those things that are helpful and those that are hurtful. Perhaps this article can add to the information you have already been given.

http://www.members.cox.net/dagershaw/lol/GoodEvil.html

I hope this helps a little more. Thanks for asking.