Stupid enough to participate in a set up..
.
This was a *very* sophisticated set-up.
They use fraud, lies, and mind-games to get the footage they want. They may have 8 hours of footage to get the five second clip.
As a hypothetical:
After six hours of working with these people, ostensibly on a project to cure cancer, they might say, we need someone to say the n-word, just for a sound test.
Then they have what they want.
You have to be very, very sophisticated and on top of your game to avoid this sort of problem.