I just don't accept that the death of a parent is somehow an obligatory part of every fictional character's backstory. That's too formulaic. Superman got by in comics and TV just fine for over 20 years with both adoptive parents alive -- obviously it is possible to tell good Superman stories without orphaning him a second time. It. Is. Not. Required.
There was a comic, many years ago, where either Superman or Superboy, I don't remember which, sent his dying parents to the Phantom Zone. He could call them up with his PZ projector to chat or whatever.