If man creates a "system" of governance then it's already unjust, immoral and economically destructive.
No individual or even group of individuals can "engineer" how society should behave and live. It has always, will always result in the "engineers" having men with guns enforcing their will.
Regardless of how smart people are, constitutions and their "laws" are just words on a piece of paper. Those words have no authority and certainly no power to constrain the actions of wicked men. The idea of an American republic was doomed from the start.
If we as a society cannot live peacefully and productively with one another then we are the problem and no amount of government or a constitution or "laws" will make us better people.
h/t Don Cooper