Literally hundreds of times in our past goverment officials have let criminals get away with crime for the good of the nation. Many times we have let criminals go scott free for providing information on other criminals.
The principle that sometimes it is better to let criminals get away with crimes if it is best for our society has been in force for as long as the nation has existed. We have caught Americans who were Russian spys. They were traiters. But if they would flip and help us catch other spies they walked. They never faced any charges or indictments of any kind for the treason they committed.
There are many times in many jourisdictions where guilty men are never charged for the good of society as a whole.
Letting criminals off with out indictment or trial is done every day in the USA. That it was done with Clinton was not unique or even unexpected or even unusual.