But that money wasn't really stolen from the fed. It was stolen from somebody who had a fed account. We know exactly who lost money, and the answer isn't everybody.

Yes, but impact of Bitfinex far, far greater. It represents about 0.75% of all Bitcoins. If you include only paper currency, there's almost $1 trillion in circulation (about 4x that if you include coins). I assume amount on deposit is much higher. However, being the most generous with the numbers, the Fed hack represents 0.002%.