I'm an advocate of the death penalty for many things, but this isn't one of them.
For this, public torture is more fitting. And I'm 100% serious. You could charge admission, or you could make it a pay per view event.
Or, you could have it like American Idol, where people call in and vote what sort of torture to use.

Again, call me sick, but I'm not kidding.
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Soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo many people will bitch about, and I feel that would have much room to speak.
So, make them be slaves instead. If you make them slaves, you basically pronounce that they're dead, and they're only working to help redeem what they have done. But they can never actually be redeemed under an circumstance. (Unles they some how stop aliens from taking over the planet or something bizarre like that) How much help does a dead body to help out a country? Honestly.