Yes, pigs don't leave much behind - just the wellies maybe?
Feeding humans, especially already dead ones therefore likely to have been ill, and to a closely related species such as the pig, would raise all sorts of problems for spread of disease. We can see from China just how easy it is to fascilitate the evolution of cross species epidemics and even pandemics just by living too closely with those animals, and eating them is just asking for trouble. Exposure to birds of prey and wild scavengers might be more acceptable, and would help those species to prosper (unless the 'body' died of bird 'flu!)