You're wasting your time with nonsense... "Defender of the Forest" doesn't mean vegetarian. Elves need to eat and dress. If we follow your logic, then elves should also shoot humans for hunting animals and cutting down trees for their homes, etc. In general, the elves in the 5th part are very similar to Native Americans, who also hunted and killed animals, but only in the amount necessary to survive, while the Americans-cowboys-bastards went and shot all the buffalo in a short period of time, often just for fun.
It's better to discuss the demons – why don't they comply with fire safety regulations?