There is no such thing as the "best set of rules". Best for who? All known societies has been known to have inherent differences of interests. What is in the interest of one group or class is mutually exclusive to the interests of another.
Furthermore the best way to solve problems change over time in accordance with the historical, social and technological development of a society. Thus, even if we were somehow able to find one common set of interests for the entire society the way to suit these interests the best would change with time and new rules would be preferrable.
The poor complain; they always do
But thatís just idle chatter
Our system brings reward to all
At least all those who matter.