excerpted :
Though this was not stated explicitly, the government's rationale in not pursuing criminal prosecutions against the bank was apparently rooted in concerns that putting executives from a "systemically important institution" in jail for drug laundering would threaten the stability of the financial system. The New York Times put it this way:
Federal and state authorities have chosen not to indict HSBC, the London-based bank, on charges of vast and prolonged money laundering, for fear that criminal prosecution would topple the bank and, in the process, endanger the financial system.