Honestly why set a safety lock guardian scrolls are cheap and easy to get.
Ehhhh, I think safety lock has nothing to do with dropping items (on a private server). And on the other hand, it has a whole lotta reasons to be there on the official ones.
Safety lock, in my opinion, was not made for PK purposes. It restricts trades, selling to/buying from an NPC, dropping, opening bank, checking mail etc. It was probably added so that people could protect their accounts from scammers and/or force log their characters before the safety lock was unlocked.