For an American, the answer is simple and obvious: You are EIGHT TIMES more likely to be killed by a law enforcement officer than by a terrorist.
The stats CATO cites are from here, and are themselves issued by the National Safety Council, the National Center for Health Statistics, the Census Bureau, and mortality data from the CDC.
The point of the original post was to point out how fantastically rare acts of terror are, and to helpfully keep people from making stupid choices based on their fear of a very unlikely event.
That doesn’t take away from the stark reality, though, that Officer Friendly is, statistically speaking, much more likely to kill you than Al Qaeda.
Note that these stats are for all Americans, and do not reflect the new rules that apparently allow cops, or people who wish they were cops, to kill unarmed black men with impunity.