So what's the root cause? When we drive a truck full of food for the poor over the border, is it stopped and relieved of its contents by men with guns who sell

So what's the root cause? When we drive a truck full of food for the poor over the border, is it stopped and relieved of its contents by men with guns who sell the food and the truck to non-poor people so they can buy more guns? Or is it because nobody wants to drive that truck full of food in the first place because the poor don't have anything worth trading for it?