by Ken Ballen and Peter Bergen
October 5, 2011 What motivates someone to become a terrorist? That's the question former prosecutor Ken Ballen set out to tackle when he traveled to Saudi Arabia and Indonesia to interview more than 100 Islamist extremists. "We've never sat back and said, 'Let's really understand our adversaries,' " he says.
<iframe src="http://www.npr.org/player/embed/140947193/141051616" width="100%" height="290" frameborder="0" scrolling="no">
NPR thanks our sponsors
Become an NPR sponsor
Support The Programs You Love