Why are we not allowed to kill

[Don Corleone]

It really comes down to moral relativism versus moral absolutism, doesn't it? As much as the concept of universal justice is ridiculed and bemoaned by the sophisticated elite, without it, can one really formulate a solid argument against anything as being inherently bad? If one can, doesn't that mean one has unconciously stepped into the world of moral absolutes themselves, no?

I have tried as an intellectual exercise to formulate arguments against theft, battery and murder without resorting to the use of universal concepts. I guess I'm meant to be a defense attorney, because at the end of the day, I find myself much more capable of rebutting said arguments than I am of formulating them. Any justice system I can propose that has apriori prohibition on murder or theft requires the concept of moral absolutes.

For those of you sniffing "theocracy, by any other name, does it not smell so sour", note I said moral absolutes and universal truths. I did not say that I require a concept of a supreme being. I believe one can codify law based on moral absolutes without the need for a formulator of said absolutes. "LIFE" in and of itself can be a moral absolute, without the need for a life-giver.