When you say beyond belief I hope you mean it disgusted you. I hope Denmark allows for his extradition.
^^Spoilers in response
Warning: Spoiler! (Click to show)
He didn't leave the country with diamonds or gold but he did pour thousands of euros and francs into the hands of the very people he was trying to expose. The only way he could get his footage was to legitimately become one of the bad guys and he justified it throughout the movie by saying that there are people doing much worse. The guy is a dirtbag if you ask me.
The glaring difference between undercover police officers and this guy is that when police authorize money they recoup it. From my count Brugger put 135k euros in the pocket of a shady passport dealer and his equally suspect Liberian lawyer, and 15m Central African francs in the hands of an oppressive mine owner/corrupt politician.
The only worth beneficiary of this documentary was Sumeet, Indian match tycoon.