Lately I've come to have doubts about the ethicality even of prison, though I don't yet know what I'd suggest instead. In general Ive come around to the idea that the very notion that causing suffering creates a "debt" that must be repaid with more suffering on the part of the perpetrator is itself toxic, because if some way can be found to cause a person to live a life that will not inflict more harm without hurting that person, then that method would be better, at least in a utilitarianist sense, than something more "fair" relying on punishment. The challenge of course is in finding that way is.