Why are they making Robots that eat food?

This is just asking for trouble when the robots start going on a human eating rampage. [Link]

The idea of EATR is ostensibly that military reconnaissance droids far behind enemy lines would be able to forage for fuel. Robotic Technology Inc, lead contractor on the EATR, puts it thus:

EATR is an autonomous robotic platform able to perform long-range, long-endurance military missions without the need for manual or conventional re-fueling. The patent pending robotic system can find, ingest and extract energy from biomass in the environment, as well as use conventional and alternative fuels (such as gasoline, diesel, propane and solar) when suitable.

The machine runs on a "biomass furnace" which powers a steam generator driving a "waste heat engine" from Cyclone Power Technologies. These pieces of kit will now be mated together within 90 days, according to RTI.
The robot steamers are envisaged as being equipped with powerful articulated arms in order to rip trees or bushes out of the earth and stuff them into their glowing maws. By way of a treat, it seems that the machines will also be able to loot or forage more conventional fuel supplies from the petrol tanks of cars, domestic gas cylinders and so on. Cyclone says that their engine can also run happily on old apple cores, banana peel and other kitchen garbage gleaned from bins.
Hapless drivers or householders will be in no position to object to such robotic plundering: military reconnaissance vehicles are typically heavily armed, and doubtless the EATR will be no exception. It might also be fitted with DARPA's SELF tech, enabling it to construct copies of itself and modify its own design.

UPDATE: EATR is a vegetarian and follows the Geneva Conventions. [Link]

RTI’s patent pending robotic system will be able to find, ingest and extract energy from biomass in the environment. Despite the far-reaching reports that this includes “human bodies,” the public can be assured that the engine Cyclone has developed to power the EATR runs on fuel no scarier than twigs, grass clippings and wood chips – small, plant-based items for which RTI’s robotic technology is designed to forage. Desecration of the dead is a war crime under Article 15 of the Geneva Conventions, and is certainly not something sanctioned by DARPA, Cyclone or RTI.
“We completely understand the public’s concern about futuristic robots feeding on the human population, but that is not our mission,” stated Harry Schoell, Cyclone’s CEO. “We are focused on demonstrating that our engines can create usable, green power from plentiful, renewable plant matter. The commercial applications alone for this earth-friendly energy solution are enormous.” (emphasis in the original)