I don't think the argument is that the current system of subsidies is well organised. It is simply that the over-production of food probably has some significan

I don't think the argument is that the current system of subsidies is well organised. It is simply that the over-production of food probably has some significant national security advantages. Running out of food is even worse than running out of oil, steal or microprocessors. This would only be likely happen in a wartime scenario and it would force you to invade another nation to secure access to food or surrender. Having to do this (invade) when you are already obviously streched to the limit would be a significant disadvantage.