Who is considered to be the narrator in "The Ones Who Walk Away from Omelas?"

This is a very interesting question.   Simply put, there
is little definitive as to the identity of the narrator.  There are some hints that
allow for an analysis as to who the narrator could be.  The first element is that the
narrator is someone who knows of Omelas quite intimately.  The narrator possesses
knowledge and understanding of Omelas' practices as well as the citizens' mindsets.  The
narrator fully grasps that there is "no guilt" in Omelas and understands how the town
and its people function, in general.  At the same time, the narrator has detailed
understanding of the child who remains in the room and whose suffering the people of
Omelas' happiness is contingent.  The narrator also understands the condition of those
who walk from Omelas.  It is here where the narrator is elusive, not describing these
individuals' plight in as much detail or with as much precision as both the town or the
child.  This could bring out a couple of thoughts as to the identity of the narrator. 
The first would be that the narrator is someone who walked away from Omelas and still
wrestles with the implications of such a decision.  Little is known except for agony. 
Another thought as to the identity of the narrator could be someone from the outside,
such as a social scientist.  The use of suggestions that "we here in the West" is an
indication of this.  Another thought would be that LeGuin herself assumes the totality
of the narrator in order to fully articulate the agonizing position of choice in which
the reader must be placed.  It is here where I think that her role as narrator moves the
story from literary work to philosophical study.  In each of these cases, the narrator
is designed to give the reader a view of Omelas and, in turn, of
themselves.