That governments in all forms throughout history have had one purpose only--to keep the population fed. People have an endless capacity to endure abuse from those in power as long as they are kept satiated. The moment the food stops flowing is when revolutions occur, and not a moment before.
To be more precise, that's not the purpose, that's the means. The purpose is to extract the maximum value out of the livestock. Now, to do that, governments must find the right balance of propaganda, social programs and freedom. It differs for different countries. Western countries are no exception: it's just that people are taught that government serves them, while the opposite is actually true. Government is power and anyone who believes it is there to serve his interest and protect him is a fool.