Ignorance is not stupidity, but it might as well be. - Lois McMaster Bujold

Even soldiers in battle have to be brought to a special state of mental excitement to shoot total strangers.

Pym looked at the bugs, glanced at the sleeve of his proud uniform, stared again at the deadly parody of his insignia the creatures now bore, and shot Miles a look of heartbreaking despair, a silent cry which Miles had no trouble interpreting as, Please, m'lord, please, can we take him out and kill him now?

It's an interesting problem, though, for writers of popular series. Should one throw one's protagonist over the Reichenbach Falls, or let him fade gently into the sunset of the Sussex Downs, keeping bees? (Or both?) No matter which the writer chooses, someone will be unhappy about it. If one's audience is large enough, it will collectively demand every possible closure, most mutually exclusive.