Funny, I remember nitrogen gas being promoted as far more humane than lethal injection or existing gas execution. For years it was touted as the solution no one was using because of I guess sadism. Now someone is using it, and of course it's instantly denounced. You just can't win...
Okay yeah, but that's not the discussion. You'd might as well say all methods are equally bad because it's the act itself that's the problem, and at that point the state can break out the human mincing machines knowing it'll get just as much or little pushback no matter what it picks.