Governments are inherently the largest criminal actors, they have a monopoly on the enforcement of law. Corruption is a natural consequence of a world governed by profit. What happened when whistleblowers stepped forward on the true extent of international financial crime? Nothing.
The question is not how a government can hold itself or its citizens accountable for white collar crime, the question is why and how these structures exist.
Look at the money laundering records of the largest banks, their cooperation with organized crime. Look at the slush money and criminal activities of federal law enforcement, military, and intelligence agencies.
The answer is that profit governs our global society and holds the greatest sway in political power structures.
As long as our world is governed in this way, then the world can be looted and plundered without consequence. Money laundering is just a vehicle for legitimizing these activities.