cruelty would be inflicting pain for its own sake. in so-called factory farming, the pain is still only incidental. that is, if it were possible to create the same outputs with no additional inputs, and that process had no pain, there is no reason why a factory farming operation would prefer the painful process. so it is not cruel, it is only indifferent.
Would you kick a dog in the street? Shoot a cat with a bb gun?
no. these are cruel. practicing cruelty toward animals may create a habit, and end with practicing cruelty toward people, which would be immoral. it is best not to practice cruelty at all.
this is just posturing and rhetoric. i have no problem with most forms of exploitation (this is true of most people i think). my problem is unfair, or even non-consensual, exploitation of other people.
the vast majority of the world's soy (about 85%) is pressed for oil in an oil press for human use. the byproduct of the press is called soy meal or soy cake, and would be a waste product if we didn't find a use for it. currently, almost all of it goes to feed livestock, (about 70% of the entire crop-weight).
soybeans are used by people, and we feed the trash to livestock.
how?