Perhaps human genes were put into the pig - and for reasons connected with Plato's description of the reasons for the sinking of the lost continent . After the flood in which Atlantis sank, Noah's descendants remembered that the pig was a left over of a distasteful era and so was unclean. There's the fuzzy thought that our current cycle of history might have happened before. Here's the rational logic. The human body digests food.
Food is made up of living matter.
Living matter is chemical computer code. Computer code relies on subroutines. Our bodies may depend on subroutines we don't know about yet but which get Genetically Modifed - changed. We'll know about the subroutine when the body fails. Genetic modification of these subroutines is dangerous in two ways.