DC is already woefully over staffed with overpaid folks living off of guaranteed tax revenues, I don't believe in the inherent productivity there, and just cynical enough to believe it's a means for AMZN to leverage political power and government contracts.
NYC is understandable ...
... but it would have been really nice for business diversity for that to go to so many other places. Chicago, Texas, Toronto, Raleigh, New Jersey etc etc.