The argument that the underlying reason pork is forbidden is that it's unhealthful, harbors disease, parasites, and, especially trichinosis doesn't hold water either.
Diseases can be transmitted by "clean" animals just as easily as by pigs and, in many cases, more readily. Tapeworms are more associated with beef than pork. Brucilllosis was a common animal transmitted disease, but the more serious cases are associated with cows, goats and sheep, not pigs. And anthrax -- "woolsorter's disease" is not associated with swine at all.
Saladin's physician, Rabi Maimonides, in 12th C. Cairo, did declare that God's ban on pork was because of health concerns: pork "has a bad and damaging effect upon the body." But he had no explanation for this, nor did he offer any evidence.
The fact is, the ban on pork predated any general knowledge that it might be unhealthful. It wasn't till the mid 1800s that the link between undercooked pork and trichinosis was discovered. And what effect did this have? -- Jews rejoiced and started eating pork! An orthodox backlash put a damper on the fad, though, maintaining that if the reason God condemned pork was a health issue He would have banned only the eating of undercooked pork.
The ban was socio-economic. See post #4.