Catastrophic Terrorism- Thinking Fearfully, Acting Legally

The time has come to move beyond howls of alarm to a public discussion of what policies should be adopted or reformed. That discussion should proceed even as crucial questions remain only partially answerable: How realistic is the possibility of catastrophic terrorism? How easy is it to make a catastrophic device that actually works? Why would any person or group want to kill hundreds, thousands, or tens of thousands of innocent victims?