Power is like money. As a means to an end it is useful, it can be used for good or evil. We may rationalize our pursuit of it as a higher moral order, that it benefits mankind and others.
When either power or money becomes ends in themselves then everything is rationalized in their pursuit. When those at the pinnacle of power speak of their service to mankind examine where they live and how they live and who they associate with that will tell you who they are and who they serve. Wealth achieved through political power is different from wealth achieved through a serving a free market; it requires compulsion.
“The village may have replaced the state, and in turn may have replaced the fist with the hug, but an unwanted embrace from which you cannot escape is just a nicer form of tyranny.” Jonah Goldberg, Liberal Fascism