The FBI, to its credit in a self-serving sort of way, rejects the routine use of the polygraph on its own people.
The missionaries go forth to Christianize the savages - as if the savages weren't dangerous enough already.
But everyone gets burnt, don't they? Certain things are outside of your control. I suppose the only thing you can learn as a director is to not put yourself into situations where it can get outside of your control. And that's what happened.