Solitary confinement for those violent criminals with mental issues keeps the entire prison pop safer.   Not sure I have ever heard of a sensible replacement that doesn't start and end with more psych reviews and a reintroduction to the mainstream.  How long before one of the mainsteams are suing because of attacks and a poorly thought out govt reaction to a deep problem ?   Perhaps those violent offenders with mental issues should be placed into a mental institution where they could then be placed into solitary confinement.