My son-in-law and daughter live and work on a hog farm. His employer raises pigs for slaughter. His employer's father, on the same property, keeps breeding sows. The number of hogs they fit into those buildings is insane. The waste is atrocious. They stack the pens so the ones above eliminate on the ones underneath. And, of course, there's the food they are given - gmo corn with antibiotics and hormones added into it.
I have never liked the taste of white pork, but love bacon and ham. I just don't eat it because I've always known of the way it is raised and gets to market.
Cows, pigs, poultry - it's big business. People have to eat.