The general rule of thumb I've personally observed (YMMV) with those who hold such absolutist externality related positions is they hold it right up to the minute that someone else much more powerful and deep-pocketed than they start unilaterally imposing externalities upon them. Your abbatoir example is a good one, and the other one I've seen in real life is when a Swift, Cargill or other similar mega-agribusiness setting up a CAFO feedlot next door.
The odor externality from the manure piles/lakes usually riles such characters right up, but that is the least of it. Even when the manure management challenges are properly mitigated (and there are no such CAFO feedlots that can mitigate to only 2-3 incidents per year, it is more like 20-30 per year for the average one), neighboring properties like your parent commentator's are adversely impacted with sharply increased pathogen and contaminants control in their groundwater. As rural properties like your parent poster's usually rely upon well water, this becomes a pretty acute issue for neighbors.
Fracking operations also are frequently very sloppy with their adverse impact upon groundwater, even though they are very diligent upon staying on their property. Redress that makes whole including judicial system interaction expenses is difficult, expensive even for single-digit liquid assets millionaires, and rare.
At the end of the day, this has many characteristics of a classic engineering modeling problem, subject to unperceived historical biases. People who hold absolutist property rights interpretations like your parent poster are generally historically biased to a time period when such interpretations were couched in an energy-poor and population-sparse time of our civilization. Back then, as long as one was within approximately human- and animal-power scales of energy over the generational time span, and rural population densities, externalities from large scaling scenarios were rare for most people, and mostly theoretical. With our current access to energy and ability to rapidly densify neighboring properties, the available externalities to present materially change, and the interpretations (which are actually the mental models we work with) break down in the face of a engineering-like scaling step change that requires categorically different solution spaces.
I'm personally very sympathetic to your parent poster's position, but realistically, my personal experience has informed me of the dynamic I've shared, and I've since substantially modified my position.