Yeah, Dead Rising 3 doesn't make sense in a world that regularly deals with zombies. You think they would have figured out stuff like "Airstrikes: massive damage to infrastructure, slowing down any survival or recovery efforts, while causing relatively little harm to the zombies," "Deliberately shooting civilians is evil and counter-productive from an intelligence-gathering standpoint," and "At first report of zombification, everyone goes to their government-issued shelters, is checked for infection, and put on lockdown while military teams sweep the city. It'll suck spending a week under armed guard, but that's better than literally everyone dying and posing a threat to the rest of the country." Zombies never change how they operate, they're the perfect danger for the military to plan for because it's exactly the same every time.
Also, "Dead Maintaining" sounds like it could be an indie game; you're the only zombie whose mind is intact, and you decide to take care of your undead companions. You've got to herd them away from enviromental dangers, make sure they're fed regularly, and deal with any human incursions coming to wipe you out and take back the city. I'm picturing a cross between Lemmings and Dungeon Keeper. I'd buy it on Steam for a dollar.