A healthy moral immune system produces a low-grade fever of anxiety when we consider cheating. The home trainer’s job is to lower that fever. They do so by a process of graduated exposure therapy. First, a very small lie with no victim (a false compliment). Then, a small lie with a diffuse victim (cheating on a quiz). Then, a lie with a specific but deserving victim (shortchanging a rude cashier). Each step, the home trainer provides the rationalizations: “They can afford it.” “They would do the same to you.” “The real crime is being stupid enough to get caught.”