Its not "parts" its obvious to any critical thinking person thats reviewed the evidence that its systemic, the legislation itself literally justifies torture and abuse on a mass scale, its not "some bad apples".
Again, from the victims point of view, they all go to the same slaughterhouses, there is no happy magical slaughterhouse where they get tickled to death.
Youre forgetting something though, I used to hold the same views as you (as does 98% of the UK) because my parents taught it to me, as they did you, everyone around you does, its legal, its completely normalized...... until it happens to animals we dont consider as just food or commodities. Maybe take a look at the "cataplut swan thread" you might start seeing cracks in this so called "deeply held conviction" that people have.
Il post the same video I posted in there.
Theres also a simple test here, would you accept that same treatment in that "high welfare" slaughterhouse for humans?
If the answer is no, which I expect it will be, im going to ask you the
morally relevant difference between humans and pigs which justifies doing it to them but not humans.