Because, clearly, Putin is actually a treacherous necromancer preparing to unleash swarms of militarized birds on the city.
Some have also seen the face of Steve Jobs and a handful of other figures in the birds, and of course, many are questioning the authenticity of the video altogether. Perhaps it was Vigo the Carpathian
preparing to exact revenge on New York after his defeat in Ghostbusters 2
, in which case we know who to call...