Are you sure? My city's big enough that a 100-kiloton nuke in Times Square would probably just break my windows here in Brooklyn. A full megaton in Times Square might do some damage to my building, but I doubt it would kill me outright, and might not even injure me. A lesser bomb, like the 10- to 20-kiloton nukes Iran is said to be developing, would do even less -- figure it would wreck most buildings in a half- to one-mile or so radius.

Here's a simulation tool you can play with.