I dont think this is specific only to DR, salami, hot dogs, processed meats in general including hamburgers etc are accepted by the public as being lottery food. You may get the brain, you may get the penis, a healthy serving of poop and mixed with an unhealthy doses of chemical toners to disguise what infact you really are eating and often required to bind the food. The only real difference in this food and dog food is the chemical agents that are not present in dog food, hence the disgusting smell of dog food, but in most cases it is the same mix, ingredients etc.
Same with processed fish, fish fingers, fish cakes etc, basicakly most things held together by breadcrumbs are basically what is scooped up from the factory floor and the bits not used in more premium servings, including fish poop. I worked in a Birdseye factory when I was at Uni, amazing the sh1t that goes into these things.
It's normal across the board, what people don't know rarely hurts them.