I guess I'm a bit slow here. If a trusted person is let into a house, and that person intentionally takes a valuable item, then if detected, it is reasonable to believe that the thief will most probably not be invited back. Oh I see. The dishonest act is interpreted as a betrayal of confidence, and the betrayer may never be allowed, in any way, near the treasury of the heart again. You are getting the picture.
People react to deceit.
Some react mildly. Some react with very strong emotions. They, in varying degrees, betray and get betrayed. If we thought that we would get caught, then we wouldn't do that particular deceptive act. That's exactly what I was going to say.