Thread:AmazonAlexa99/@comment-26339491-20160428182556/@comment-26339491-20160603184856

That's so they can remove content that violates Wikia's terms of use. For example if a user writes a perfectly good post that the admin doesn't want to delete entirely, but that contains a link to a porn site, or an illegal streaming site, the admin can just edit out that link.

Or, to give you another example, an admin might edit a spoiler warning into a message if a new user who doesn't know the community's spoiler policiy, posted spoilers. There are several good reasons for why an admin needs that ability - though as with all other admin powers, this one should be used responsibly.