It is a dark day for the rule of law. 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. They also have not charged any top HSBC banker in the case, though it boggles the mind that a bank could launder money as HSBC did without anyone in a position of authority making culpable decisions.

Clearly, the government has bought into the notion that too big to fail is too big to jail. When prosecutors choose not to prosecute to the full extent of the law in a case as egregious as this, the law itself is diminished. The deterrence that comes from the threat of criminal prosecution is weakened, if not lost.

In the HSBC case, prosecutors may want the public to focus on the $1.92 billion settlement, which includes forfeiture of $1.26 billion and other penalties, as well as requirements to improve its internal controls and submit to the oversight of an outside monitor for the next five years. But even large financial settlements are small compared with the size of international major banks. More important, once criminal sanctions are considered off limits, penalties and forfeitures become just another cost of doing business, a risk factor to consider on the road to profits.

There is no doubt that the wrongdoing at HSBC was serious and pervasive. Several foreign banks have been fined in recent years for flouting United States sanctions against transferring money through American subsidiaries on behalf of clients in countries like Iran, Sudan and Cuba. HSBC’s actions were even more egregious. According to several law enforcement officials with knowledge of the inquiry, prosecutors found that, for years, HSBC had also moved tainted money from Mexican drug cartels and Saudi banks with ties to terrorist groups.