If someone’s mental capability makes them a danger, you’ll excuse me if I see no issue with the reality that there are places within the modern world, and the United States more specifically, that believes their actions warrant their death. This is not a medieval concept of justice, it is pretty universal for the human condition. If you are willing to accept a moral equivalency between the harm caused by a sexual predator towards an innocent child and the summary execution of a dangerous criminal, then I’m sure you’ll forgive me for believing you have a backward sense of morality.