I've taken a liberty and tried to condense/classify OP's stated reasons against; my classifications in
bold:
- Smell, flies, rodents (sanitation)
- noise (annoyance/human quality of life)
- pollution (chicken
), run off from poultry, Death loss disposal, disposal of in trails when harvesting (sanitation/sustainability)
My thoughts on each class of issue:
- Sanitation: Managed via coop/run cleaning, feed management, composting, and fertilization
- Annoyance: This is subjective to the individual in question, and is accounted for via zoning/HOA rules. It is on each person to know what they are zoned for or allowed on both sides
- Sustainability: Poop and bodies/entrails both function as fertilizer; no waste or pollution involved unless we're objecting to fertilizer itself as a pollutant? If so, then a backyard keeper is still doing less than a commercial one just based on numbers
Every stated issue is manageable in a backyard setting, so long as the flock is scaled appropriately and follows zoning/HOA standards.
I'm guessing the objection is more based around a judgement that backyard keepers do NOT do these things, and therefore should never be zoned to own chickens in the first place. I understand being frustrated with humans not "doing things right according to me" lol, because that happens all the time! But thankfully I don't have the power to revoke almost everyone's permission to drive just because a lot of them don't do it the way I think they should. Zoning and HOAs, if also imperfect, at least help establish expectations that greatly reduce the number of conflicts we'd have otherwise over items exactly like this.