No. When found guilty, they should be beaten to death. Not hung. Not lethal injection. Beaten to death with lead pipes or baseball bats. I am a firm believe in doing what we can to make the punishment fit the crime.
The Pagan Karmic Debt crede of "whatsoever you do returns to you three-fold" should apply to their death sentance if possible.
Luckily, the founders thought differently. They disagreed so strongly with your views that they took the trouble into proscribing the very view you described above in the Constitution itself.