The problem FOR THEM is that eventually supply and demand of the physical commodity will catch up with them. They can create all the paper shorts they want but they can not make warehouses full of real stuff. Commodity bull markets end when there is an over supply and not before. At this point there are still no large inventory surpluses in most commodities and the more that mining is suppressed with regulation and low prices the worse the problem will get. 

The way they are talking now it is almost like they have never seen a price elasticity chart.