Correction:MacDuff had to alter the computer files in order to insert himself, demote Riker and add the information about the "Lysian War." It's possible that he ended up messing up some other files while he was at it, and no-one would have noticed anything wrong because their memories had been wiped.
Correction: MacDuff had to alter the computer files in order to insert himself, demote Riker and add the information about the "Lysian War." It's possible that he ended up messing up some other files while he was at it, and no-one would have noticed anything wrong because their memories had been wiped.