I'm not disputing the use of single parents or lack of parents in the entire literary world, I'm disputing its use in Where the Wild Things Are and the new Star Trek. This trope fits those examples you listed because the trope occurs naturally through the circumstances of the story. I haven't read R&R or Gilgamesh, but Star Wars is an excellent example. Luke's aunt and uncle died because they bought the driods the stormtroopers were after, it was a natural consequence of the events. Wild Things and Star Trek did not have natural, logical events to support the trope, thus I conclude the authors simply forced them into the story to serve a function that was unnecessary. Divorce and dysfunctional relationships (as I recall) we not in the original book, why would it suddenly be in the movie? Kirk's father and Spock's mother did not need to die; in the normal timeline where Kirk's father is alive, Kirk is in Starfleet. In the movie, they kill off his father to motivate him to do what he was going to end up doing anyway. Spock's mother did not need to die,[insert need for sleep here. zzzzzz...]
edit: the deaths of billions of people should have been enough, it was enough for us in Star Wars with Aldaraan. The way she was killed was very annoying too, they suddenly make up a rule that you have to hold still while being transported, almost makes sense, but that apparently flaw in the transporter system reared its ugly head to kill Spock's mother then never showed up again. Very suspicious.