[WD40forRust]

>serial killers kept away from the public

That's not punishment, that's social risk management. Punishment is the deprivation of dignity which the system imposes. Those cells should be a minimum of two-star hotel, the doors should be mostly controlled by the occupants, they should be treated in a dignified manner like any member of the public, they should be paid competitive wages for their work, any housing and restitution charges on those wages should be capped at 1/2 and commissary must charge median prices so as to encourage savings and financial independence on release, etc.

There's also eliminating custodial sentencing for acute nonviolent crimes.