I've just listened to a podcast from backstory radio that you might enjoy. It's an hour long programme about past visions of America's future (the Jetsons for instance, a book by Asimov and so on), and there's a segment in there about why people in fiction like destroying New York.
This is the link to the entire show:
This'll take you to the apocalyptic segment:
If you're like me you'll want to watch I Am Legend again after listening.