Owning two accounts is against the rules. But it may be a necessary evil, if evil it is.
It allows to test. It allows to see the forums through several ways. It allows to separate powers: moderation and normal use.
Employees who work for Internet firms will need to create several accounts to test the system. System administrators will create several accounts: to administrate, and to use.
Beside, it will reduce the risk to edit a post instead of quoting it. Some people will recognize themselves.

Frau Brönimann
I'm not afraid of the old woman. I'm a moderator, she's not. She causes troubles, she's toasted. Plain and simple.

Anyway, it is now common knowledge she was not a real troll. She was a troll usurpator.
Am I a n00b punk Mod?
I would rather like b@ck-fr0m-d33p-sp@ce J3d1 b1rd. Doesn't it sound better?

Did I take care of Lets_be_fair01?
I wasn't the one to dispose of the offending posts. I came after the battle, only to see the last remaining post. It was referring to a "last message" that didn't exist anymore. I had to delete this message as well, or explain the missing information. The message wasn't against the rules, so I chose the second solution.
Lets_be_fair01 is still free to post. He has been warned.