To be perfectly honest, I read this short misreading Omelas for Omlets. Story about people who walks away from omlets sounded pretty cool in my head. 
 Felt like Author herself is least aware of this Omlet city and found some reader imagination urging on the same. But God, I dont know what to feel. I am depressed and confused. Land with no guilt seems like a good idea and the ones walking away might have found the guilt, thats what I think. 
 On a more contemporary basis, we are so used to the travesties happening in Middle East and stuff and acts all normal on death and destruction there. So we could be taken as those Omlet people. The only time our consciousness gets triggered are when something happens to our kins or neighbourhood or developed countries. Where as the guilt might make us walk out of our Utopia saying Ciao to face whatever out there.