"It wasn't nice for her" says it perfectly, ajanela. The OP is about izzywizzy, not about the dead man, who would not have been feeling ill-treated or undignified at all. A screen was put around him and, as someone has said, he was probably covered too. What's undignified about that?
His death was not a result of violence, nobody else was in danger. Why do we feel the need to be protected from such a natural part of life?
It has occurred to me that I've never seen a dead human body. Once when I was working on my allotment a shocked yell of "Oh my god!" came from the canal. Some people in a narrowboat were passing and had spotted a body in the water. I went to the edge of the canal but the body was hidden by overhanging bushes. As the people in the narrowboat seemed shocked (as you would be), I dialled 999 and explained what had happened. The boat people moored their boat. I went up to the road to await the police. I was affected in the sense of feeling sorry for the boaters as they were probably on holiday. As my mum said when I spoke to her about it: "They won't forget that holiday." I was also affected because the police wanted me to hang about as a witness. We had had an Australian visitor for a week and he was due to leave later that morning so DH put him on the line to say goodbye.
It turned out that the dead man had been at the fiftieth birthday party of my allotment neighbour at a pub a little up the canal. It seems he had fallen in because of intoxication and drowned. An unnecessary accident. I was not upset by it, though my allotment neighbour was, unsurprisingly as she knew the man. I was simply a little inconvenienced. Shrug.
It sounds as if the shoppers in the OP story were not even inconvenienced. Why should they be? The unfortunate man's death had nothing to do with them.
If one thinks supermarkets are disgustingly money-grubbing, one shouldn't go in them. Put your money where your mouth is as the saying goes.