I've run into some difficulty discussing utilitarianism and the social contract because the typical response is something specific to Mill or Rousseau. It's not quite ad hominem argument -- they're not saying "Mill was a bad person; therefore, utilitarianism is useless" -- but they point to flaws in Mill's work as reasons to dismiss utilitarianism.
Is it possible to separate the philosophy from the philosopher? And I suppose a related question would be: Has anyone tried to update/revise utilitarianism and the social contract?