Item Unlock Requests

Hate you? All it takes is a little jealousy. You're severely underestimating how awful people are. I'd say at least 90% of everyone you know isn't trustworthy.

or a nasty mistake, like not logging out of your PC while you run to the bathroom and a four year old gets ahold of your character and drops everything you own, in the FM. (seen it happen, bye bye quest items that Nexon won't return, refund, or even allow to be reobtained).

as for jealousy - Seen a girlfriend delete all her boyfriends characters while he left the room because "he was paying more attention to the game than me". Wasn't premeditated, just a heat of the moment thing, and "it was just a game".

Seen a roomie change passwords (unrecoverably) on another roomie just because it amused them and they didn't see the harm.

Stuff happens. Doesn't take any great and abiding hatreds or jealousy. Additional security measures are a way to help minimize what sort of things can happen to you.