A couple of the more interesting facets of this story is Cicero whose 

allegations were all the more startling because he implicated himself. He spent hours explaining to Mr. Torres-Landa the mechanics of how he had helped funnel bribes through trusted fixers, known as “gestores.”

and that of Joseph R. Lewis, one of the lead investigators:

In less than a year, Mr. Lewis’s beefed-up team had doubled its caseload, to roughly 400 cases a year. Some executives grumbled that Mr. Lewis acted as if he still worked for the F.B.I., where he had once supervised major investigations. They accused him and his investigators of being overbearing, disruptive and naïve about the moral ambiguities of doing business abroad. They argued that Corporate Investigations should focus more on quietly “neutralizing” problems than on turning corrupt employees over to law enforcement.

We tend to look at corporations, especially the mega multinational corporations as some kind of monolithic entity, and usually an evil monolithic entity.  The reality that like any organization, they are populated with a diverse group of people.  People who operate with their own individual moral compass.