Other terrible side effects of our subsidies are a reliable food supply as we overproduce far beyond what's necessary which makes us nearly immune to supply shocks like pre-1930s america. Ever heard of famine in the united states in recent memory? Didn't think so. Know what else causes nutritional deficiency? Not eating. While there may be some problems with our current system, they are firmly in the "good problem to have" territory.

Exporting food for free is a more complicated topic, on the imports side, protectionism is justified for critical functions. If we outsourced our food production, we could get it more cheaply (it's already cheap), but imagine if a supplier suddenly decides to cut us off? Food security is a national security priority moreso than typical military stuff like steel mills.