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https://truthout.org/articles/cori-bush-introduces-bill-to-end-moral-catastrophe-of-solitary-confinement/ This bill seems reasonable enough. Solitary is quite inhumane.
Also, someone is going to be released sooner or later.
Being locked up in solitary all the time is going to make it even harder to adapt, especially if they have some kind of mental disability.
They're already being punished and serving their time by being in the prison.
If you read the Eighth Amendment, it says:
"Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted."
Is this not cruel?