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Cruel and Unusual: Should Capital Punishment Hurt?
Other punishments dealt out by the judiciary are usually not expected to be absolutely consistent and identical.
Differentiation of punishments would harm predictability of criminal sanctions.
Two people sentenced to equal terms in prison can have two very different experiences in prison, and thus very different experiences of punishment.
Even if completely consistent standards are unachievable, they should be pursued whenever possible. The fact that pain is a more subjective punishment than others should be a reason for caution.