Consider this. Rabbits can chew through nearly anything given enough time. They have long scythe like claws much sharper than that of a cat. A mother rabbit defending her nest will sometimes disembowel a predator.
Now pump this up from tiny innocent little rabbit, to a Labrador sized powerhouse.
To sum it up in a quotation from one of the slashdot replies.
Giant Rabbits To Feed North Korea
In the future, they'll be able to reuse 97% of that headline.
Giant Rabbits Feed On North Korea
But as a serious reply. Read the article. These things eat more food than they produce. The scientist who bred them refuses to sell theme for reasons of inefficiency, and even if those weren't factors, NK's communist totallitarian government would squander the food supply anyway. Which is the reason North Koreans are starving right now. They don't lack for farm land or Natural resources. The people just don't get any because the government pours it all into the military, knowing that the people are ready to revolt, and despise the oppressive communist regime.