The article also discusses the fact that sunken vessels are home to a lot of marine life - local fisheries get their catch there, as the wildlife thrives in those locations.
Thus salvaging the steel robs local folk of their income.
I think that another way of looking at this story is some 'god' miraculously tidying up the litter that humans have carelessly left at the bottom of the ocean for one reason or another. In this magic universe the mystery tidy-up persons should be thanked for doing such a thorough job, leaving not so much as a bolt behind.
It is all so much easier if the human remains part is conveniently ignored.