Who defines good and evil?

We take a look at a murder, and we say it's evil.
We take a look at the death penalty, and we say it's good.
But the act is the same in both-Murder!
How are we defining what is good and what is evil?
Who are we to take a man's life no matter how innocent or bad he/she is, and call it good or evil? Who defines it? Was it the society or is it our own mind?

Quote:

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Originally Posted by Shana

We take a look at a murder, and we say it's evil.
We take a look at the death penalty, and we say it's good.
But the act is the same in both-Murder!
How are we defining what is good and what is evil?
Who are we to take a man's life no matter how innocent or bad he/she is, and call it good or evil? Who defines it? Was it the society or is it our own mind?

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Society defines good and evil for their own purposes and it made us believe in their theory. In fact, If we understand a person or a situation there is nothing as good and evil and everything make sense to us.