Given of course we're already talking about a criminal justice system which effectively says to the accused: you're on trial for your life; if we find you guilty we're going to kill you. Given this - and everything that may go with it (concocted or withheld evidence, highly political cases, bungled trials, disparities between the imposition of a death sentence in one case and not in another almost identical one, and so on and so on), does it even matter which method they use? I'd say no, not really. They're all inhumane in principle. The practice is simply another layer of inhumanity, to a greater or lesser degree.