none of the death penalty methods are deterrents. they have no impact on crime. in fact, many crimes have grown arithmetically since the advent of the penalty. as well, you seem to want to cause pain - hundreds of people who were executed in the way you recommend died as innocents. they were only exonerated later by DNA evidence. often, even though the state knows the person is innocent, they push the execution through anyway, because they don't want to lose face.
you solution isn't a solution - it stops nothing, but increases the death toll.
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