The only way capital punishment works, if, you don't kill the person because of punishment, but you kill them because of the enormous risk of keeping them alive.
Now, I still disagree with this, but in the case of a terrorist ring leader like Osama Bin Laden (who was captured by the brittish, and held untill the Americans could rescue him, of course he escaped), or something like 3:10 to Yuma (as in the movie that recently came out), where someone of extreme risk is captured, and you're in enemy territory, or very close to it, then maybe, under those extreme circumstances, killing your victim is the only choice, if of course, he/ she poses a great threat alive and free.
But this wouldn't even be put under trail, it would more be a military execution, so even that doesn't realy count as captial punishment.
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