The thing is - 'don't commit the crime' might be a legitimate answer if it wasn't for the fact that huge amounts of offenders come from poor socio - economic backgrounds, have experienced abuse from families or in LA care, have mental health problems or learning disabilities.
If we had a criminal justice system full of people with good mental health, no developmental disorders with non- abusive childhoods with all the help and support they needed, I'd say 'yep, you had every opportunity and you fucked up, you made capacitous decisions so do your time and stop moaning'.
But it isn't like that. I've worked in prisons and mental health hospitals. In prison, you meet the very occasional good background, healthy individual who took the wrong road. But it's so rare it is commented on.
In the overwhelming majority of people, you're working with neglected, abused and clinically disordered (either MH and or/developmentally) individuals.
The kids that you watch on Children in need or similar and feel great sympathy for but they don't stay cute and the damage that was done to them is then inflicted on other people and then we don't care anymore. They should suddenly be 'decent' members of society despite nothing in their lives ever being 'decent' or teaching them that.
And I'm not a 'leftie' or a 'bleeding heart'. People should be punished for crimes they have committed but the punishment is the deprivation of liberty.
Prisons are horrible places and the prison system itself does enough to punish. It's enough. Violence or injury is outside of that punishment.