Yet US prisons do solitary confinement. It is estimated that 4% of inmates are wrongfully convicted(innocent, at least of the crime accused). Inmates have diminished capacity of communication, consumption, safety. There are a disproportionate populations in prison to respect to crimes actually committed.

Your indignation is just because you value freedom very lowly. It is true that another man's freedom is so worthless to oneself that it doesn't sate your thirst for vengeance.