[XCabbage]

Editing of answers is fine - by anybody, not just mods. That's because there's a clearly shown "edited" section displayed at the bottom of the answer, along with the editor's name, right next to the "answered" section showing the original author's name, indicating to anyone who reads the answer that it's a jointly-authored post that isn't entirely the original author's work. You can also look at the revision history to see exactly who wrote what. There's no false attribution there.

Comments don't have this history or indication of being edited by a third party, though, which is why only moderators have the power to edit them and most such edits are considered unacceptable and banned by policy.