Why the silver price remains mid-teen range?

Last summer, the silver price(COMEX) dropped before it reached to $21 which was said to be the critical point for further up move. This spring, it dropped before $18.5 which was said to be the first threshold to move higher. The price contoller contains the silver price not to threaten the US dollar. That's why the controller never stop beating the silver price despite many people criticize the silver price manipulation. That is to say, the controller keep manipulation unti ll they abondon US dollar. When they abondon US dollar? It should be the time the US dollar system collapsed. Can you imagine such a moment could come to the world? It's probable regarding recent global debt situation. But it's unimaginable for most of the investors. That is the real reason that the silver price remains mid- teen range.