The sky didn't fall after July Fourth

Story highlights

  • Authors: In post-9/11 world, there are few incentives not to raise terror alert and issue warnings
  • But there are significant costs to these terror alerts, both economic and social, they warn

Peter Bergen is CNN's national security analyst, a vice president at New America and a professor of practice at Arizona State University. He is the author of "Manhunt: The Ten-Year Search for bin Laden -- From 9/11 to Abbottabad." Haley Peters is an intern at New America and a graduate of Duke University.

(CNN)It's the week after July Fourth. And, yep, pinch yourself because you are still alive, as are more than 300 million other Americans.