So the NHS workers who tried to keep him alive were wasting NHS resources? And risking further expenses from a trial and either imprisonment, or detention and treatment if it was determined he wasn't responsible for his actions by reason of insanity.

As for the possibility that if he had lived, and had turned out to be involved in a jihadist cell, other lives might have been saved in the future, not worth considering that.

Save the cash, and avoid any possibility of anything that he might have experienced as a punishment.