I would prefer to feed fruit and veg waste as it does at least look like food, unlike the cardboard we are supposed to buy in bags. Not so keen on scrapings from plates etc as you can't tell what is in it and I don't like to feed pork to pigs (not sure they mind tho!) Also commercially, people are not always very careful and can see possibilities for getting light bulbs in swill for example.
Also depends very much on your set up, personally I cannot see the argument that someone raising a couple of weaners for the freezer is going to be spreading disease among the entire pig population of the UK when the pigs have only ever left the holding to go to the abbatoir. Obviously, if they were breeding and selling them the situation would be different.