This is quite interesting. To paraphrase:
Lots of mundane stuff like falling down stairs and allergic reactions kill more people than terrorism. Although obviously not at the same time. If everyone who was going to die from anafalactyc shock did so in the same instant, for example, that would be more people than in your terrorist attacks.
(See also This more eloquent article)
Now, at no point do I condone terrorism. I think it's despicable. However, despite our government's "War on Terror", I think that the terrorists might be winning. Why? Because everyone is afraid and we're letting the government slowly take away our freedoms to "fight terror".
“Any society that would give up a little liberty to gain a little security will deserve neither and lose both.”