> Those are big percentages of export.

Until you have a bad crop year. That's when you are glad you are in the habit of massively overproducing for seemingly unnecessary reasons. Like we saw glimmers of during the 2022 global food crises, those exports (and other uses, like biofuels) start to wind down when the locals begin to worry about going hungry.

> If a farmer goes under and sells to another farmer, at the margin why should we care?

We don't — unless many farmers are all at risk of going under at the exact same time. That's when disruptions become realistic. That concern isn't limited to farming. 2008 and 2020 showed great examples of where we feared many players in other industries all going under at the same time and did what we could to prevent that from happening for much the same reasons.