@angusm In the MAGA imagination, there's a large urban population who do nothing but drugs. As a result, MAGA thought holds that re-enslaving them to perform agricultural labour would be doing them a favour and only foolish leftist nonsense about human rights prevents this sensible solution.
This is not quite the same thing as the "enslave every leftist" take or the "food crisis = infinite authority (because everyone will panic)" take, but all three sets of ideas slosh around together.