Those who pushed trucks in pickle rooms had sores so bad it knocked them out of the world.
Butchers often lost their fingers and mainly thumbs during work.
Beef-liggers wore men down and often caused special diseases in the chilling rooms.
Fertilizer men often fell into the vats and when they were fished out it was way too horrifying to look at them.
Question #2:
The author says that the job of the fertilizer man was the worst because they fell into the vats and were tortured. They couldn't be looked at even when fished out because it was so horrifying.
Question #3:
They were sliced and it ruined their looks and made people terrified to look at them.
Question #4:
All of them are extremely bad, but I would become a butcher. They lose their thumb and certain fingers, yes, but they don't get diseases and life-sthreatening consequences like everyone else.