I've defended Spam here before. I've worked at the Hormel plant in Austin, MN a number of times. There is nothing mysterious about what goes into Spam and it's all decent pork shoulder and pork ham - no other scraps. The stuff is prime rib compared to potted meat or baloney. I've seen that stuff made too.
After watching Spam being made I would eat it out of the can in the company parking lot. After watching potted meat being made I won't ever eat it again.
A bud used to work at Underwood. He said that potted meat was even better before it was canned. Said the hams it was made from were outstanding.