How can anyone deny that the price of silver is being manipulated

When every week or so a [i]single order[/i] like this (July 6 at 19:00) will smash the price? This drop was roughly 10% and was so steep that it was declared to be a glitch and trading was frozen for a bit, but I think that's just not true. Glitches like this don't just happen in systems like this that deal with many billions of dollars and are supposed to have so many fail-safes that they're impossible to break.