Zombie Cliché Lookout:

One of the keys to surviving the zombie apocalypse is being able to rely on one member of the group to be a voice of reason. Generally speaking, this person has some sort of authority in the regular world; they might be a boss, or a policeman, or an officer in the military. But then again they might just be an average Joe who’s sick of listening to all the squabbling. Whatever they are, they know the value of a team working toward a common goal rather than being distracted with petty infighting while the shambling horde of walking corpses silently bears down on them.