Joel Salatin touches on some similar points in "The Marvelous Pigness of Pigs: Respecting and Caring for All God's Creation.
"Modern factory farms and slaughter houses violate every tenant of this principle and results in untold violence as a result. It also removes the responsibility from us where each individual needs to work on this relationship. " A gal I work with was mortified that I had no problem humanely processing the animals that I nurtured and raised for food or assisting a fellow homesteader in doing so. She did not however have a problem with slaughter houses. There is a tremendous disconnect!
RE: Spiritual protocol for harvesting plants or animals