Identify Any Fallacies in the Following Passage Either by Naming

Short Answer

Identify any fallacies in the following passage either by naming them or, where they seem not to conform to any of the patterns described in the text, by giving a brief explanation of why the fallacious reasoning is irrelevant to the point at issue.
He: I believe everybody should be permitted to cheat.
She: That's absolutely ridiculous.
He: Why do you say that?
She: Well, assume that everyone were permitted to cheat. To say they are permitted to cheat means that it's all right for them to cheat, right? And if it's all right for them to cheat, then there's nothing wrong with cheating. But then, if there's nothing wrong with what they're doing, they wouldn't be cheating. So your suggestion is absurd.