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.”