Well, it's pretty obvious why they do it (more exports, therefore more money, for the US), but I find it extremely hypocritical that they do it... "let's make a free trade deal where we can sell you food that our government extremely subsidizes" well that just doesn't sound very much like a free market, more like a state-subsidized one... then they have the audacity to complain when foreign governments do the same (e.g. with aircraft companies).