Pachy, if we follow the greatest commandment ever given, there shouldn't be any trouble with morality. But alas, we don't even know how to love ourselves so how are we to love our neighbor? Human love has so many interpretations, strings attached, etc.
As long as this world has been in existance, you'd think someone would have come up with a "science." But science is a study of whose laws are capable of
accurate quantitative expression. Too many variables when you deal with humans. Behavioral science deals with human action and seeks to
generalize about human behavior in society. There's your variable. I think our human laws already provide that, at least in the US and most of Europe. Even so, cultures are so diverse that it's almost impossible, if not completely impossible to even being to generalize throughout the civilized world.
IMHO, only a "one world govenrment" could you even begin to establish something like a generalized behavioral science that would dictate what is moral and what isn't; never mind establishing a set of laws that the populace of the whole world would abide by! And as far as a "one world govenrment" goes, I'm outta here!

Unless you know my personal beliefs, I'm sure you'll miss the humor behind "I'm outta here!"
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.