This is my guess-

I think it boils down to what would cause absolute panic in the gold and silver market. (Hopefully without the rest of the financial world melting down in the process.)

The silver lawsuits got more exposure from the financial mainstream than ever before. What would happen if a gold one came about that implicated the keepers of the gold in the gold suppression scheme and some of the "expert gold bears" were shown to just be paid schills in the scheme?

If I had mega bullion stored in one of these facilities I might panic and demand my gold. What if my gold had been lent out as part of the game? Things could get ugly very quickly.