Door Locks.

[Sebiale]

Time to pull out my trump card.

Flaw 1: Make a chest. Surround it in doors. Nobody can even get to it unless they pick a door lock. That's really annoying. Alternatively, people could just make a hallway with a ton of locked doors, making it impossible to reach anything.

Flaw 2: Make four locked doors facing each other. If raiders come, go inside the circle of doors. You cannot be killed unless the door is unlocked. If someone starts to pick the door, open and close quickly and the picking will fail.

Flaw 3: People could lock other people's doors.

1: You can already do that with other chests . . .
2:
-Surround them with lava. Now they're screwed.
-What keeps them from coming from above or below?
-Most importantly, you can't place 4 doors on a single block. So your problem can't exist anyways.
3: You can also lock other people's chests . . .