Ryan Singel from Wired News has compiled a color-coded chart of the most dangerous threats to Americans resembling the alert system from the Department of Homeland Security and as it turns out Al Qaeda is at the bottom of the list.
Comparing official mortality data with the number of Americans who have been killed inside the United States by terrorism since the 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma reveals that scores of threats are far more likely to kill an American than any terrorist — at least, statistically speaking.
In fact, your appendix is more likely to kill you than al-Qaeda is.