“My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. What was I comparing this universe with when I called it unjust?”
— C.S. Lewis (Mere Christianity)
In order for evil to be more then just a bad flavor, that someone else may like there has to be an absolute standard. If we let people choose what is good and what is evil what are we to say to people like Jeffrey Dahmer who did unspeakable things to little boys? He did not think he was doing evil. If individuals can do terrible evil, and think they are doing something good can be so terribly wrong can we really be justified in saying that individuals get to decide what is good and what is evil? If it is up to the individual to decide such things what can we say to the people who think they are good little serial killers?
How about societies, do they get to decide what is good and evil? Most of the world at one point believed that slavery was OK, but now they don’t. Since society at one point thought slavery was good, does that mean it was good? No slavery as it is typically thought of was never good. No matter what society used to say.
If both society, and individuals can be terribly wrong about morality where does it come from?
I will talk about this more in part 2
To learn more I suggest reading
Relativism: Feet Firmly Planted in Mid-Air