Gareth, the head cannibal in The Walking Dead.
The latest season has introduced a cannibal cult (now defeated) that Rick and his merry band have had to overcome. Yet for folks who have supposedly been living by their wits for years now (and whose group includes military veterans), they still haven't learned how to move as a group with point men and flankers, nor how to maintain listening/observation posts when stationary, nor even rudimentary perimeter security. People are always haring off on their own and getting into trouble or endangering the group. I mean, how did these people stay alive this long, other than the good graces of the writer's imagination?