He is what
anybody would honestly be like in this situation. Real life ain't like the Hollywood movies about Zombies where everyone gets along and a dirty blonde hottie saves everyone. (+1 if you can name that movie) In real life you would have two types of people: Cowards: Those who cower in a corner crying and wetting themselves. Fighters: Those who care only about themselves and possibly a few close friends depending on which type they are. Also they have a "Fight or get the **** out of my way, NOW" mentality.
The Warrior may not be the nicest guy in the world, BUT he is your best chance of survival because that is the only thing that concerns him. He finds a safe place that is far away from civilization (and graveyards
) holes up in a safe house and then waits it out. He may be an ass, but can you honestly say that in a life and death situation like this you would act like a hero? I do not think you can because you haven't been in that type of situation.