Rehab and crime have little affiliation. That's what I believe. This is because the essence of rehabilitation is to help individuals overcome challenges, injuries, or disorders and neither of these 3 situations relate to the motive for murder for instance, or the reason for fraud.
source
What I mean is if a man decides to defraud people of their hard-earned money it is not necessarily because he is injured or has a disorder, most times, fraud is born from financial desperation. They just want to have money and more money. Some of them have justifiable reasons; they were born poor, their loved ones were dying, and they almost dropped out of school, while others are driven by sheer greed and envy for others.
Either way, out of 10 people who defraud others, only 1 can be found to have a disorder, if any at all.
Now over to a crime like murder.
Murder, from my own point of view, comes from an insane desire to be in control of the state of another person's existence. These men, or women, just want to end someone else's life because they want to prove that they are in control.
This insane desire as I have described may be caused by a disorder, but in most cases, these men are in their right senses.
However, I believe that these people can change. Just the way they fought for control over someone's life, they can fight for control over their own lives. They can accept to go in for therapy to identify what triggers or triggered the desire to snuff life out of their fellow man.
I also believe that the only criminals who can change when caught are those who regret their actions and those who made a mistake.
Some hardened criminals would only walk into prison when caught to make strategic plans in order to do worse things when they are finally released. Even if it's after 20 years.
Some other criminals can have a change of heart when they come to a turning point in their lives just like in the movie, Miracle in Cell 7, they can decide because of a strong cause to come to a positive change of heart so that their loved ones and even themselves can have peace, but the idea of rehabilitation, I don't think it would work so well on criminals.
In my opinion, the people who need rehabilitation are people who have excessively used and misused drugs and hard substances. Those categories of people have a challenge; heavy dependence on substances to feel good or over their physical and psychological problems. When they are sent to rehab, it is easier for their challenges to be identified and corrected by experts.
But which expert, no matter how professional, would want to be left in a room with a murderer for instance?
I really do not know the best way to make sure those criminals do not commit those hideous crimes again. Even prisons and correctional facilities these days do not seem to scare them anymore, but it is better to keep them there with all of the measures put in place for them to be punished.
It is better they are behind bars than for them to be running freely among the masses, causing harm.
I don't know how effective it would be, but the judges can decide that every criminal guilty of murder should spend the rest of their life in prison. Some of those criminals do not deserve to be released, the big question now is, how do we know the ones who are genuinely ready to change so we can give them another chance at life?
If certain decisions are taken, like sentencing every single guilty murderer to life imprisonment with hard labor for instance, many others who would have loved to change or atone for their mistakes would never get the opportunity.
These criminals are first humans and so they all deserve to be given a chance to live, which is why they should continue being kept in correctional facilities. One can never tell who will decide to change and when.
As for fraudsters, maybe they can be educated about money generation. Most of these people have been engineered to believe that it's okay to make money just anyhow. Perhaps, if they are taught otherwise when they are caught and being severely punished, they will be purged of such thoughts and seek knowledge on the right way to make money.
Again, this is only my line of thought which may turn out to be wrong or ineffective, but I believe that a man's decisions are influenced by the knowledge he has. If these people are given an opportunity to make genuine money, they would take it with both of their hands.
