Solitary confinement is a form of torture. But of course there is no torture in the US. If the US does it, it can't be torture.
>Nietzsche is a complex and provocative thinker, but he is a clear advocate of the role of solitude in every level of human activity, from philosophical and psychological to creative and societal.
Can't do any of those in solitary confinement. Solitude you choose is quite different than being locked in a small room indefinitely.