I understand your points, but you cannot assume that the murderer who planned this is normal in any way, although he/she may have a good facade, if this person is a psychopath, as I strongly suspect, then all bets are off where normal morals and emotions are concerned. Psychopaths are not human in the way you and I are, so it is very hard for us to understand them, but I studied psychology in university, as well as doing research later for some psychiatrists, and having read a good deal about them, I do understand that they cannot be seen as normal humans at all, more like intelligent ruthless predators, who have killer instincts and a level of selfishness, and feelings of superiority, that goes beyond the worst animal predator you can think of. IMO