JBS and the meat industry as a whole are not only horrible towards farm animals, but are also far worse for workers than most people realize. There are multiple human rights watch reports about working conditions

https://www.hrw.org/report/2019/09/04/when-were-dead-and-buried-our-bones-will-keep-hurting/workers-rights-under-threat

https://www.hrw.org/report/2005/01/24/blood-sweat-and-fear/workers-rights-us-meat-and-poultry-plants

And unfortunately this is not just limited to the US (though it is worse in the US)

https://www.theguardian.com/environment/2021/sep/28/revealed-exploitation-of-meat-plant-workers-rife-across-uk-and-europe