One thing you have to understand when reading Omelas is that it was also written when science fiction had an enormous problem with pedophilia- one that everyone in the industry knew about and chose to ignore. Marion Zimmer Bradley, her husband Walter Breen, and others were active kiddie molestors at WorldCon and Isaac Asimov's son was caught in the 90s with what was at the time the world's largest collection of child pornography.