The narrator should forgive himself for what happened it was just his instinct to run he couldn't control that. It was ks fault for being there at the beach when he knew that they were in the middle of a storm with typhoon. The narrator also shows he cares because he has flashbacks all the time he couldn't even go back to his home town for 40 years.
Just like soldiers coming home in the (moral logic of survivor guilt by nancy sherman). The narrator feels responsible for ks death just like all the other soldiers