Where did you get this insane idea that subsidizing actual farming and agriculture is a bad idea? Do you not like eating or being alive? I agree the subsidies are probably not 100% efficient but the intent is to keep you alive in times of famine or worldwide catastrophe.
We don't live in a planned society and many many people have made mistakes about where to farm / raise livestock in the US. The good news is they usually eventually give up if the place is unsuitable, sometimes there are outsize subsidies that allow bad practices to go on forever, but in general it does correct itself. That land eventually (especially in non desert areas) returns back to its norm, where badly planned cities will take a much longer timescale to return back to nature.
We don't live in a planned society and many many people have made mistakes about where to farm / raise livestock in the US. The good news is they usually eventually give up if the place is unsuitable, sometimes there are outsize subsidies that allow bad practices to go on forever, but in general it does correct itself. That land eventually (especially in non desert areas) returns back to its norm, where badly planned cities will take a much longer timescale to return back to nature.