Pigs are not as dirty as popular media would have you believe. They are no dirtier than other animals we eat. Rabbits eat their poop all the time. People still eat that.
It depends where and how it is raised. Mad cow came about because they were feeding ground up cows to other cows.
ALL meat could be considered suspect and dirty. especially ground beef, which is very often colorized to make it more appealing, and partly filler.
Or fish, where you THINK you are buying Tuna, but are being duped by Escolar. A fish which has certain toxins that cause diarrhea and other digestive issues.
Our veggies are filled with pesticides, and even "Organic" food products are never entirely clean.
Plus, I like pork. [parasitic bomb] tastes good.
Ever had grilled pork? Real good. I recommend it with a side of apple sauce. It really complements it.
Also, as previously stated, Chicken can be FAR dirtier than Pork. Ever heard of Salmonella? yeah. Pork doesn't have that. Chicken does, and frighteningly often. Which is why when handling it you have to make SURE you thoroughly wash any surface it's touched.