sigh...
IMHO, there are 3 classes of criminals:
1. Those who can be rehabilitated quickly, committed no violence, and need to avoid the criminal justice system and especially prison at all costs. Diversion is the name of the game. These are the people who can be or are contributing members of society, but somehow screwed up. Get them treatment or community service or whatever, but get them back to work and paying taxes again.
2. Those who can be rehabilitated, but it will take substantially more time to do so and/or committed violence in their crime(s). These people need some measure of punitive control, but often we neglect the fact that we *also* need to try to rehabilitate these people; teach them a trade or at least get them a GED. This is probably the largest section of the prison population. This is also why we have such a high recidivism rate in the US; we make it extremely difficult to live life after prison without turning back to crime.
3. Those who simply cannot be rehabilitated and/or their crimes are too heinous. This is the category reserved for serial killers, serial rapists, mass shooters, etc. The people simply need to be segregated away from society.
Now a couple of misnomers, again, IMHO:
-prison is not a strong deterrent to committing crimes, neither is the death penalty. And this isn't because our prisons aren't strict enough or we don't execute enough people or they get too many appeals; the fact is that most people who commit crimes believe they won't be caught, therefore consequences of actually being caught don't register to them. Also, many first-time criminals have no idea of the actual laws and sentences.
-sex offenders are not all creepy pedophiles. You can be classified a sex offender if you commit statutory rape, particularly in states without so-called "Romeo and Juliet" laws.
-felons are not all violent criminals, or even criminals at all. For example, in Texas, if you flee the police in a motor vehicle, it is felony evading. But this is definitely a matter of subjectivity; you could not see the police trying to pull you over or you keep driving to a safe spot to pull over; an over-zealous LEO and prosecutor could slap you with a felony. Don't think it hasn't happened to perfectly law-abiding people.
Getting back to the topic: I only checked two boxes, mentally defective and fugitives. Mental illness is too wide-ranging a classification, as is felon, considering how many non-violent crimes are classified as felonies.
again, all just my
humble opinion.