The Banks have destroyed the value of the people's currency through inflation and debt monetization. They scoop off more and more of the productive value of society's output and produce no "real" wealth on their own. If a man can no longer own the fruits of his labor and if that labor isn't enough to cover his cost of living the consequences are debt, bankruptcy, relationship problems, divorces, suicide.
Revolutions may drape themselves in great ideas and political rhetoric but the truth is most revolutions occur because people can't afford a loaf of bread.