Tyler Cowen highlights this critique by J. Hughes:
[W]hile most transhumanists are liberal democrats, their Enlightenment beliefs in human perfectibility and governance by reason can also validate technocratic authoritarianism. Even staunchly libertarian transhumanists appear to be blithely unaware that arguments for government by benign superintelligent beings that know human interests better than we do recapitulate arguments for totalitarianism from the French Revolution through Marxist-Leninism.
The Dish 