I think the most important thing is that people/scientists are slowly acknowledging that animals can have emotions and aren't just machines. I hope this acknowledgment will help improving conditions for animals in farms.
Pigs are supposed to be cheap and people aren’t supposed to care if we kill them, they become food, and maybe someday as carriers for human organs for transplant. Same with animals like chickens, just raise them and eat them. Seems pointless to focus on the emotions of these creatures. Better to start with animals like dogs and cats that are more meaningful to societies.
Because I don't think pigs are "supposed" to be slaughter fodder any more than <insert oppressed human class> is supposed to be enslaved/genocided/paid less/made into soap.