I got the first question in this Reddit video interview with Max Brooks author of the best zombie book ever, World War Z . I asked what would need to change in the story to account for all the people that are zombie fans. He basically said that his story was about people knowing there is a crisis and not doing things about it.
But the troops in Harlem in the book didn’t know they needed to do headshots. So while I like the answer a lot, it isn’t perfect.
 This is a good book independent of zombies. It isn’t really about zombies, but the rest of the world.