Critics like the Occupy Wall Street demonstrators decry the bonus system for its lack of fairness and its contribution to widening inequality. But the greater problem is that it provides an incentive to take risks. The asymmetric nature of the bonus (an incentive for success without a corresponding disincentive for failure) causes hidden risks to accumulate in the financial system and become a catalyst for disaster. This violates the fundamental rules of capitalism; Adam Smith himself was wary of the effect of limiting liability, a bedrock principle of the modern corporation.
Bonuses are particularly dangerous because they invite bankers to game the system by hiding the risks of rare and hard-to-predict but consequential blow-ups, which I have called “black swan” events. The meltdown in the United States subprime mortgage market, which set off the global financial crisis, is only the latest example of such disasters.
Nassim Nicholas Taleb has "a solution for the problem of bankers who take risks that threaten the general public: Eliminate bonuses."