What is problematic is when decision chains get abstracted out and decisions depersonalized, and a bunch of company executives in a room decide how many chickens they need to fit per square foot of space in order to turn a profit next quarter, rather than those decisions being made by the people who take care of the chicken every day.
In that light, the psychology and social systems at play in industrial farming isn’t too different from that of prisons, internment camps, etc. Lives that are abstract numbers in profit equations to decision makers who don’t have to see up too close what those numbers really represent.
The difference is that humans are broadly capable of understanding the moral consequences of their actions, and in the west we seem to have developed the concept of showing mercy to animals (stunning and sticking rather than bleeding animals out through the neck while conscious).
While some animals have more complex proto-moral behaviour, they would not be able or willing to extend these same courtesies to us, in the reverse circumstance.
We inject a lot of assumptions about the nature of non-human animals in these discussions in what I think is an attempt to keep them as mentally distinct from ourselves as possible.