I encourage active skepticism - when people are being skeptical because they're trying to identify the best course of action. They're trying to identify the next step for themselves or other people.
I can't go and shoot people in the back of the head because It's a kids' movie, which is actually quite a good test because you haven't got the overt threat of a knife in the face.
All was well, until I reached the port of Havre. Three officers with the rank of lieutenant, whom afterwards I knew to be Scotland Yard men, came aboard and demanded to see my papers which they took away from me.