Constant—The Faulty Judgment of the Powerful

There is something about power that distorts judgments more or less. The chances that a powerful person will make an error are much greater than those of a weak person. Power has recourse to its own resources. Weakness must draw on reason. All other things being equal, it is always true that those who govern have opinions which are less just, less sane, less impartial than those whom they govern.

http://www.harpers.org/archive/2011/04/hbc-90007897