User blog comment:MisaRestInPeace/Why continue to suspect? Ending up miserable? My questions. Contains spoilers./@comment-4495599-20120807040642

I believe that the "end up miserable" is directed to the human psyche. Humans being humans have to endure the consequences of their actions, the psychological pressure of killing and the moral implications of it. Since the Death Note allows anybody to become a killer, the chances of not being ready for using it are high. Shinigamis on the other side are amoral, just kill for living and they all form a balanced community, not like humans, they can't end up miserable. Well, that's just my opinion ^_^