I think people judge the outcome of these very consequential lethal decisions morally rather than based on their legal merits. In fact I doubt most people are equipped to judge cases on their lethal merits. At the end of the day if a badly supported law is passed that many people agree with, they'll go along with it. If a well supported law that people disagree with is passed, they'll complain until someone finds a problem with it no matter how minor or abstract. Many people don't understand that legality=/=morality, or they desperately want them to be the same