If you carefully read my comment, you will notice that it does not contain any appraisal. Certainly, there are intricate trade-offs involved in coming up with a good policy.
What I wanted to state is the following: Exercising the existing laws that prohibit killing and bombing people is of no use if you want to prevent terrorism. Terrorists do not care about the punishment when they blow themselves up in the end anyway. Thus you need prevention, and prevention only works when you have information.