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Now that's a big question. I'm not really sure I can even answer that properly. What's your answer and how does it relate to your point?

Living by a particular standard does not mean this standard would be sufficient to have a society working well with it as the sole guiding principle.

The purpose is to create a standard or set of standards by which humans can live together harmoniously, with systems built on those foundations. Furthermore, whatever system is invented must be self-organizing because simple human relationships like hierarchies break down when you get to groups larger than a few hundred people. This means that they must be designed in such a way that they're self-organizing, with as much autonomy and flatness of hierarchy as possible. Otherwise societies will fail. So while the underlying value, a harmonious society, is subjective, building the most efficient system to meet that end can be done so objectively.

I don't think your conclusion follows from your points here. To me the conclusion that you can do it objectively (or at all) is an unsupported assertion.

I understand why you would want it, I don't understand why you all of a sudden assume that it is possible and that it is made possible by the principles that you live your life by.

Sure if everybody lived by the same principles, the world would be a great place, but why would you expect that to ever be the case?