Individual investors should be faulted for failing to diversify, by putting the bulk of their savings with Madoff or with an intermediary. But they should not be faulted for failing to do due diligence. When I buy a municipal bond from Merrill Lynch, should I do due diligence with Merrill? When I buy GE stock through Charles Schwab, must I (or my agent) personally inspect Schwab's books? Some things in life just have to be taken on faith.