Bradley Manning isn't the only American in solitary confinement

This article brings to light the overuse of solitary confinement in the United States.

Clearly there are cases where the prisoner is so incorrigibly violent that your only choices are to lock them up in solitary confinement, subject them to summary execution, or let them try to rape, murder, and torture their guards and fellow prisoners until one of those kills the prisoner in self-defense. Of those options, the first seems like the least bad.