I don't know that I could ever do it myself, but I don't necessarily 100% disagree with the method, either. Case by case basis, for me.

As for it being less humane than being put to sleep by injection...I have mixed feelings about that, too. Simply because it seemed like my dog, Bruno, was in pain when I had him put down. He wasn't writhing or screaming, but he didn't seem comfortable, either.