So lets say they do as you ask and roll back a few days (why stop at a day? nuke it from orbit, its the only way to be sure after all).
If I decided to get a crew together and dupe like mad again, should they wipe again? What if its done again? Roll back some more?
They fix the dupe, what if one of the dozen other methods are used? Keep rolling back?
I mean this is one way to celebrate Ground Hog Day… Bill Murray style. Just rollback a day every day.