Most comic readers don't read anything but comics or watch action movies.
I wonder if the DC writers have even read a single Greek or Norse myth in High School.
Certainly not by Dan Jurgens; his THOR, LORD OF ASGARD actually makes me nostalgic for Electric Superman.
There was a joke around the Marvel offices back in the 1990s that Todd McFarlane had a vocabulary of 200 words, and 100 of them were "f---."
Part of those shock-value deaths may be a need to clean house at DC.
I mean, would many people miss the Supermen of America or Rocket Red? Despite what the MM fanboys would have us believe, J'Onn hasn't done that well as he's repeatedly failed to hold his own book. Killing him off is a sales-neutral action like killing off Blue Beetle.
I for one would miss both those characters. Rocket Red was a great Englehart creation. As for the Supermen of America, they were a concept that had potential to be developed in the hands of a good writer. The Martial Artist that used a bioelectric field to use Martial Arts at a distance was a really trippy concept; their ethnic and racial makeup was refreshing.
This is exactly the sort of reason that I'm generally against character death, even against characters "nobody will miss" (I for one will be up in arms if Marvel ever kills off the Living Pharaoh or Texas Twister or Squirrel Girl). Novelists, who close the book on the world they create when their book is done, can kill off whoever they like because they'll never revisit it. But in serial fiction, character death is doing the one thing you are never supposed to do: close a door.
Just because Writer A, does not see future story potential in a character, does not mean Writer B will not. Eliminating a character is a waste.