Just for a moment picture, not all the evil and bad in the world, but the good.
If you think about it and 'see' in your mind's eye all of the normal, everyday families in any given neighborhood who raise their children well and are pretty much model citizens, and, with a large dose of extrapolation, extend that image to include, first, the county in which you reside, then it is easy to see that the majority of citizens are law abiding, tax paying folks who respect the rule of law, serve the country if called upon and commit no crimes.
From there we move out; If you extend this to include the entire USA you can begin to see numbers veritably in the millions of quality people living their lives in peace.
Because I have traveled extensively in the world, I can assure that this pattern, of law abiding, societally conforming people is repeated nearly everywhere in equal numbers to that within the continental US.
By now, once we estimate the total number of these people by rough estimation, we can probably assume that there are literally billions of normal psychologically mature and responsible people living all across the globe.
Does this not indicate that there may be no need for a codified document to govern moral behavior? And further, even though the newscasts paint a negative picture of the world, does it not appear to be the case that human individuals are imbued with a very strong sense of what to do to secure a peaceful and productive life and need no help from ethical theories?