The zombies in Chernarus aren't your biggest threat – the bandits are. Players who decide to go rogue, turn against other players. Instead of scavenging around for their loot, they steal it off other players. Which is exactly whats happening in the video above until the Fireman comes to the rescue, hilariously.
I've always been a firm believer that anything user-generated is what makes a game shine. In games like Day Z
and other shared world games, how players inhabit the world, the meta-game, turns the game into something completely different. Day Z started off as a survival game, humans vs the undead. As time passed, certain players took the dark path and became bandits. Going after other players for their goods and equipment. I don't imagine Dean "Rocket" Hall had bandits in mind when developing the game but I imagine that while developing the standalone, they were always on his mind.