Animals are put to sleep or slaughtered for food every day. They do not suffer like this poor American did. People go under general anesthetic every day for major operations without mishap. Surely an excecution is easier to carry out than complex heart surgery.
www.bbc.co.uk/news/world-us-canada-27220406
I don't want to discuss the pro and cons of captical punishment, but surely if the state is going to kill someone it can be done quickly and simply. Why is killing a person more complicated than killing a cow or a pig? I see no excuse for botched executions.