It costs a lot more to provide infrastructure to rural areas than urban ones. If we expect both of these to be fully paid for by our taxes, and if we expect the tax burden to be similar, that means those of us living in cities are subsidizing those living in rural ones. (And note I'm not talking about actual agricultural industries that require that much space, I'm talking about people living in rural areas just because they like it better. Everyone depends on farms, we can subsidize those.)
I'm fine with people living in rural areas if they want to, but I don't think we should expect city-dwellers to subsidize them if they do.
So what about the people who live there to provide education to the farmers' kids? What about the people who work at the local restaurants and grocery stores that serve farmers? What about the people who live there to provide trash service for the people who serve the farmers?
Where does it end and why does it end at that point?
Society [noun]: the aggregate of people living together in a more or less ordered community.
It's not like we can lay out roads and say, "this is for farm machinery only, nobody else gets to use it." So, via subsidizing agriculture, you are going to subsidize some people who choose to live out there.
I don't get how you could possibly disentangle that in any way that isn't completely unsustainable. I also don't understand why you would want to; something, something, common good.
I’m not saying I have all the answers, but something has to give.
In theory, urban pays for theirs and rural pays for theirs is fine. But how do goods get between urban centers? Is it magicked there, or is it brought via rail and road that goes through rural areas?
And then what is my incentive, as a rural resident, to listen to the voices of the individuals in the urban areas when it comes to matters like state laws? Why not get rid of those, because the impact of people who have zero input into my life is wildly disproportionate because there are so many of them? They don't pay for anything out here, so why should they get to tell me who is in charge?
Again, there isn't a clean way to do this, because we are all connected, and we are acutely aware of it. I would argue that's what separates us from animals.
I don’t think we should in the general case, but I also don’t think we should abruptly pull funding from one area (letting the infrastructure fall apart) just because it becomes abruptly fashionable to move out of that area in the near term (we’re talking about decades long time scales here). Seems like you should want some easing so you don’t have to rebuild from scratch if/when dynamics change.
But ultimately if you want less spending on rural infrastructure, that’s probably fine with me, but then don’t also complain when rural life is a luxury for the wealthy.