New York City is one of the most visited cities in the world. Therefore, it would make sense if aliens were to come down to Earth, they would choose Manhattan.
So that is exactly what the Facehuggers from Romulus did.
And even though the aliens claimed several innocent lives, it is still not the scariest thing to invade NYC. That title will always go to the Trumps. They are a parasite we can’t get rid of.
That is why New Yorkers weren’t that scared by the alien invasion. We are used to so much worse.