Well if he really is innocent, he should get a better lawyer, or flee to France before his execution.

And yes, it is murder in itself. But I suppose you could let the victims family decide whether to hang them or let them rot in jail. There's also the cost of execution. Lethal injection is so expensive, it costs more to kill an inmate than to keep them in jail for life.

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"Duty is the most sublime word in our language. You cannot do more. You should never wish to do less." - Robert E. Lee