Blame, blame, blame. It is a pity commentators don't take a more serious tac and investigate the incentive structures that FULLY explain this licentious, avaricious behavior.
Still, this article does relate some very useful nuggets:
One is the role of financial intermediaries, such as banks. Rather than seeking the most productive outlet for the money that depositors and investors entrust to them, they may follow trends and surf bubbles. These activities shift capital into projects that have little or no long-term value, such as speculative real-estate developments in the swamps of Florida. Rather than acting in their customers’ best interests, financial institutions may peddle opaque investment products, like collateralized debt obligations. Privy to superior information, banks can charge hefty fees and drive up their own profits at the expense of clients who are induced to take on risks they don’t fully understand—a form of rent seeking. “Mispricing gives incorrect signals for resource allocation, and, at worst, causes stock market booms and busts,” Woolley wrote in a recent paper. “Rent capture causes the misallocation of labor and capital, transfers substantial wealth to bankers and financiers, and, at worst, induces systemic failure. Both impose social costs on their own, but in combination they create a perfect storm of wealth destruction.”