Should punishment fit the crime? If rehabilitation is the goal, should it fit the criminal?

Why should the punishment fit the crime? As ideas of punishment were transforming prisons between the 19th and 20th centuries, and prison administrators were looking for tools to punish or rehabilitate prisoners, there were those who questioned this core tenet of criminal justice. One such prominent critic of the criminal justice system in the United States was Dr. Karl A. Menninger. Instead of asking how the punishment should fit the crime, Menninger asked how the punishment should fit the criminal.