Scary Scary Darpa

The military is developing a robot that can fuel itself on biomass, including "human and animal corpses," sure to be "plentiful in a war-zone." According to Fox News, "The advantages to the military are that the robot would be extremely flexible in fuel sources and could roam on its own for months, even years, without having to be refueled or serviced."

My question is, what will stop a wild roaming robot from trying to take a bite out of my arm  (Like CyberCom, this actually scares me).