re: Should we...
go after every muslim because he "might" be a terrorist?
How do we make the difference between a fanatic and a responsible one?
Lessons from the past: Kissinger and Le Duc Tho negociated peace and the war ended. Le Duc Tho represented a country and each country had its own diplomatic traditions and it worked.
In the Middle East, what we're seeing is this: a fringe terrorist group catches the sympathy from the population, gets democratically elected and eventually legitimally represents its country (with its diplomats, ambassadors, etc).
However, because they had been terrorists, no way would you negociate with them.
Begin had been a terrorist too and became prime minister.