"I don't say we all ought to misbehave, but we ought to look as if we could"

The quote indicates that one need to not always break rules or act terribly, however they need to give the impression that they have the possible to do so. This suggests that people should have a certain level of wildness or contumacy about them, even if they do not act on it. It might also indicate that one need to not be too buttoned-up or restrained in their appearance or behavior.