This is known:
"In a 2018 study in the Italian Journal of Food Safety, slaughterhouse workers are instructed to wear ear protectors to protect their hearing from the constant screams of animals being killed. A 2004 study in the Journal of Occupational and Environmental Medicine found that "excess risks were observed for mortality from all causes, all cancers, and lung cancer" in workers employed in the New Zealand meat processing industry.
The worst thing, worse than the physical danger, is the emotional toll. If you work in the stick pit [where hogs are killed] for any period of time—that let's [sic] you kill things but doesn't let you care. You may look a hog in the eye that's walking around in the blood pit with you and think, 'God, that really isn't a bad looking animal.' You may want to pet it. Pigs down on the kill floor have come up to nuzzle me like a puppy. Two minutes later I had to kill them - beat them to death with a pipe. I can't care.
— Gail A. Eisnitz,
Working at slaughterhouses often leads to a high amount of psychological trauma. A 2016 study in
Organization indicates, "Regression analyses of data from 10,605 Danish workers across 44 occupations suggest that slaughterhouse workers consistently experience lower physical and psychological well-being along with increased incidences of negative coping behavior." In her thesis submitted to and approved by University of Colorado, Anna Dorovskikh states that slaughterhouse workers are "at risk of
Perpetration-Inducted Traumatic Stress, which is a form of
posttraumatic stress disorder and results from situations where the concerning subject suffering from PTSD was a causal participant in creating the traumatic situation." A 2009 study by criminologist Amy Fitzgerald indicates, "slaughterhouse employment increases total arrest rates, arrests for violent crimes, arrests for rape, and arrests for other sex offenses in comparison with other industries." As authors from the PTSD Journal explain, "These employees are hired to kill animals, such as pigs and cows that are largely gentle creatures. Carrying out this action requires workers to disconnect from what they are doing and from the creature standing before them. This emotional dissonance can lead to consequences such as domestic violence, social withdrawal, anxiety, drug and alcohol abuse, and PTSD.""
(Wikipedia)
Humans evolved to be hunter-gatherers, anyway.
"The Creator" can be viewed as a rhetorical device in philosophy because "inherent rights" have to have a foundation somewhere. That whole line of thought is based on Christian philosophy, which the Enlightenment secularized.