Shane Bauer omitted some key points in his otherwise excellent piece about indefinite solitary confinement in California prisons.
Though Bauer grants that "some" solitary inmates have committed heinous acts while incarcerated, he doesn't mention offenses for which gang-associated felons commonly receive prison sentences. Typically they have committed horrific crimes of violence.
Neither did Bauer relate how the gangs' well-honed conspiratorial modi operandi serve both to facilitate commission of their crimes and to shield them from conviction through witness intimidation.
If solitary confinement is appropriate for any category of inmates, it's those with gang ties.