The article also talks about physical injuries as well. The injury rate is uniquely high for meatpacking
Together, poultry slaughtering and processing companies reported more severe injuries to the US Occupational Safety and Health Administration (OSHA) than many industries that are popularly recognized as hazardous, such as sawmills, industrial building construction, and oil and gas well drilling
Correlation isn’t causation. It’s just as likely that jobs like this attract people already numbed to violence.
The article also talks about physical injuries as well. The injury rate is uniquely high for meatpacking
https://www.hrw.org/report/2019/09/04/when-were-dead-and-buried-our-bones-will-keep-hurting/workers-rights-under-threat