Although I agree that more could be done to radicalize these communities, I think this fails to recognize that a large part of the rural US are petty bourgeois white folk who’ve historically also been the biggest opponents to marginilized workers liberation. In the early 20th century the Midwest was obviously significantly more radical than now, but it should also be noted that the urban centers, mining towns, and port cities, were also hotbeds for action. The labor struggle was advancing on all fronts, with the immigrant poor, black working class, and undocumented populations being at the forefront. Undocumented migrants are likely in rural areas due to their exploitation as agriculture workers, so in that case I’d argue that there must be more organizing on that front. However undocumented migrants aren’t really what I assume you mean when you say “rural US” and they largely exist in cities as well.

Although, I guess as a Californian I’m one of the “coastal elites” so to speak, and I may hold biases due to not having interacted with the opinions of many rural comrades at a deeper level of analysis on the subject.