You don't have to know HOW your TV works in order to know that it works.
Obviously, people agree on specific issues, such as race, sex, form of government, justice, etc. That is a fact, betty boop.
What is "just" in some societies is not just in others. That is also a fact. Put two and two together and you come up with a factual conclusion that justice is relative to the society in question, and that the each society has come up with a standard by some means.
You speak as if you were some kind of "law giver," kosta — evidently you aver statements as if they were already the laws of the universe, without putting up one single shred of evidence to back them.
The evidence is the REAL world around you which you may have left long time ago. The only ones who have no evidence are people who claim there are hypostatic entities, such as the Universal Law and Morality floating around in cosmos.
Oh that somehow "proves" might is not right? Such as America being the superpower has nothing to do with America having some influence in the world? No, of course not. Get real. Maybe reading current political events would be more helpful then some 2500 year-old Greek philosophical escapades.
I don't want your "opinion," Kosta.
Then don't ask me for my opinions.
If the standard is "in human heads" at all, it is because it first exists in natural reality. If it weren't there already, "human heads" couldn't discover it.
Oh yeah, Donald Duck exists in natural reality as a cosmic Platonic hypostasis. Otherwise Walt Disney could not have discovered him. LOL!
A social system is a complex system; a TV set is a simple system. Why/how do you find any direct comparison between them for your present purposes?
No, Donald Duck doesn't "exist in natural reality as a cosmic Platonic hypostasis." Donald Duck exists as a fictional creation of Walt Disney's mind (a spiritual entity), based to some extent (but not too much) on a naturalistic model or example of "duck," an actual observable creature often found in barnyards or on bodies of water....
If you cannot apperceive the difference between "Donald Duck" and a phenomenal duck, then kiddo, I'd have to say you're pretty far gone already....