Yeah, maybe the person has a huge overdue book fee and they want to 'erase' it!
One consequence of the hard drive stolen, is one less hard drive!!
Nah but seriously, move all the computs into the centre with a velvet rope (hmmmm...velvet rope) to section it off and ya can keep an eye on them. Maybe with a camera that can see all the computers too.
The same person might try it again.
