Regarding the meat packing plant, I'm not really sure what the objection is so I'll have to let you explain why someone might object to it. Do they put off some smell? Make a lot of noise? In both of those cases the smell or the noise would be seen as a trespass onto the neighbors' properties.
The rifle range is the same story. The new noise would be considered a trespass on existing neighbor's properties.
Regarding the hoarders, whatever the thing threatening neighboring properties (rodents, smells, diseases) would be considered a trespass.
Once someone has legitimate claim upon a property, they have the right to enjoy that property in the manner in which they obtained it. A lot of the protections of enjoyment of property that people seek through additional legislation would be built in if the laws held greater respect for property rights to begin with.
