Really? I was told it was because they (Muslims, at least) see Pigs as the closest relations to Man, instead of the scientific interpretation of Monkeys. In short, why kill/eat a Pig when it could be your "spiritual" brother...
Eitherway, Pig meat (Pork) is fairly cheap and if a human is hungry enough they WILL eat that because it's always better than starving. We are all humans on the inside irrespective of any religious beliefs.
In which case there is no sin. The Quran says:
"Prohibited to you are dead animals, blood, the flesh of swine, and that which has been dedicated to other than Allah , and [those animals] killed by strangling or by a violent blow or by a head-long fall or by the goring of horns, and those from which a wild animal has eaten, except what you [are able to] slaughter [before its death], and those which are sacrificed on stone altars, and [prohibited is] that you seek decision through divining arrows. That is grave disobedience. This day those who disbelieve have despaired of [defeating] your religion; so fear them not, but fear Me. This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion. But whoever is forced by severe hunger with no inclination to sin - then indeed, Allah is Forgiving and Merciful."
See how explanative and precise the Quran is about exactly what is allowed and what's not? That's the beauty of the Book revealed more than 1300 years ago, and applicable for all mankind till eternity.