In your perfect system, who will be the arbiters? Who will decide how we ought live? Who are these hyper-rational beings who will decide things based only upon logic?
Do realize that this is the road to tyranny.
We are as sure of the corrupting influence of power as we are of the pull of gravity. If indeed your arbiters are human beings, then they will be corrupted.
What human being can resist the temptation of power? What human can resist the lie for his own gain? He who sets the rules will set up rules for his own gain. He will fool the people.
If we set up multiple arbiters, we are still dealing with human beings. They will collude in order to devour the masses, or devour each other. Most likely, both will occur. When they see that much power up for grabs, they will scheme.
No human beings are exactly alike. They will have different forces of will. Factions will arise. Just as surely as galaxies gathered from the gravitational pull of mere differences in density, even if the differences are slight, factions will arise. We have different temperaments. We will like some people more than others. Any council is doomed to disagreement. And any council of arbiters with unlimited power will either explode into war or collapse into one demonic being.
The rational are easy to fool. They fail to notice the devious motivations of others because deviousness is so contrary to their own natures. The sharks easily feed on these guppies. The devious tyrant will overtake any council of rational arbiters.
Or the messianic will captivate the masses. How will you control him except by violence?
People will laugh at your rational arbiters. Any child knows that “because it’s for your own good” is not a very compelling argument. How will you control them except by violence?
The more violent you are, the more you’ll attract the wrong type of people. The more you open yourself up to a War Leader who has actually earned the respect of the masses, more so than your arbiters in their Ivory Tower.
Any system which values the abstract over the contingencies of history and the fickle nature of human beings will end up as either a tyranny or an anarchy. Any absolute system will necessarily use violence to compel the people to do its biddings. Any absolute arbiters will have people who chafe under their rule. These absolute arbiters will inevitably become corrupt.
Human experience has shown that the only way to avoid the problem of corruption is to separate and balance power, like our co-equal branches of government. You must also limit the time people can hold power. It is messy. But I much rather prefer this to rivers of rational bloodshed.