Peaceful, idyllic societies have a tendency to be vegetarian (if not vegan) in fiction. As often as not, these societies are portrayed as being morally, perhaps even spiritually/magically superior to our own, implying that humanity's meat-eating habit is somehow holding us back from living in a world of Crystal Spires and Togas. Sometimes it can be downright Anvilicious.
Some cases aren't so [...] [tvtropes.org]