Thinking rationally is often different from "positive thinking," in that it is a realistic assessment of the situation, with a view towards rectifying the problem if possible.

Fat people, it is commonly held, should be punished because they offend our aesthetic sensibilities. They take up too much space on subways, buses, airplanes, and elevators. They consume more than they contribute to society. They become ill and need to be taken care of, or they die early and their families are left unsupported. The only way fat people can gain some acceptance and forgiveness for their crime of overeating is to at least try, or look like they are trying, to lose weight. They must never eat an ice cream cone in public, never be seen eating a normal sized portion of non-diet food!