I agree except that it's a damn sight bloody and we enlightened (

) Americans are squeamish as hell. At least the inert gas asphyxiation (IGA) doesn't need special training, is humane to the prisoner and bloodless to watch. There are no poisons to worry about and there are still probably a few gas chambers still around that can be used as IGA chambers. It can easily be silent so the prisoner doesn't hear the deadly hissing of killing gases.
I'm almost of the mind that we should use bloody executions though because maybe that'll get more people on board to banning executions altogether. I hesitate because I still think a sizable percentage of Americans would love to witness such an event, just as towns would gather for hangings or the guillotine.