The problem with any system is that people are flawed creatures and the select few that feel the need for power will do anything to have more than their share of the pie. They can justify it however they please but ultimately every system will face serious internal threats to it's survival. Whether it is successful at defending against these threats is completely up to the masses, most of whom will likely be ignorant of the issues to begin with. Who would have guessed that the practice of "Bread and Circuses" would still endure after so many centuries.