The USDA just put in a request for .40cal sub-machine guns with minimum 30-round magazines. Why does the USDA, or any federal agency other than HLS, need machine guns, or weapons at all for that matter?
Answer: Obama is fulfilling his campaign promise to create a domestic security force as well armed and financed as the US military, by hiding them in each of the malignant, bloated agencies of the federal leviathan so that Americans aren't alarmed by it. And given that the administration litmus test for promotion in the military now is the willingness to fire upon US civilians if ordered to do so, it makes sense to do it under the guise of "agency security".
If the administration had as it's #1 stated goal to collapse the US economy, I can't think of a single thing they'd do differently than get as many Americans as possible onto welfare rolls and punitively tax and regulate business to the point of crushing it. And when the collapse comes, the government will need a heavily armed civilian force to control the population.
Here's a typical USDA bureaucrat in your living room. "Is your hamburger 93% lean? It better be, or else!"