As US$ are mostly made up fake numbers in FED and other banks computers, FED or other bank could deposit millions of $ to bitfinex (or other margin trading platform) where they margin sell all their fake $.
As they can create and send how much $ they want they can crash BTC price completely. Am I right?
Exchanges without margin trading capability may be a protection? What do you think?

BTC Donation address:
1DxbwaLGULjzujVkiRtSdSfUsxTvWbmp3h