The reality is that "leadership" is NOT a working class. It has power and authority over the society it leads, and power corrupts. Democracy is the only hope for society right now because it is the only form of government that has regular replacement of leadership built in.
However, the corrupting influence of money, controlled by the mega rich, will never go away, no matter what system of government you choose.
I'll say it again, take humans out of critical leadership positions and get rid of money.