Are you sure about that? I had the same reaction but then I starting thinking about all the horrible life-altering things a person could do to earn something like that. The penal system isn't perfect but it's what we have.
I’m not the person you responded to but, yes, I’m sure of it. In what sick alternate reality is an indefinite period of constant torture to be considered a reasonable sentence for anything?
What percentage of people in solitary confinement do you think this describes? In any case, it sounds like your hypothetical prisoner should be in a psych unit.