if bitcoin is backed by the US they see it crashing they will surely help bitcoin but that is not being done. bitcoin goes lower ur being manipulated.
But that us not the case, and Bitcoin is decentralized and not backed by any government. So it's reactions would not be linked to gov'ts. There is no witch-hunt aimed at Bitcoin or cryotocurrencies in general.
As an investor you should be up-to-date on latest news and updates and what could cause a drop or an up.