Is the SEC Covering Up Wall Street Crimes?

According to a whistleblower, the SEC has been systematically destroying records of investigations for the last twenty years:

By whitewashing the files of some of the nation's worst financial criminals, the SEC has kept an entire generation of federal investigators in the dark about past inquiries into insider trading, fraud and market manipulation against companies like Goldman Sachs, Deutsche Bank and AIG. With a few strokes of the keyboard, the evidence gathered during thousands of investigations – "18,000 ... including Madoff," as one high-ranking SEC official put it during a panicked meeting about the destruction – has apparently disappeared forever into the wormhole of history.