What I suggest is for prisoners to not become a drag on the economy. Executions are expensive. Life in prison is expensive. If a person has murdered several people with little chance of being exonerated, then we should not be condemned to pay for his lifetime sentence in prison. We should not be condemned to pay for all the additional prisons to keep the increasing number of them fed and kept. It's not unreasonable to say that they should provide for themselves; we have to provide for ourselves. It's not vengeance, but solving a problem with as little impact upon the state as possible. We can't afford to keep them all alive, but can't let them go free. There are higher priorities than those who's lives are essentially over.