Megan McArdle, Columnist

Tallying Right-Wing Terror vs. Jihad

It's complicated enough. No need to stretch the numbers.

Why not count the Beltway snipers as Islamic terrorists?

Photographer: Davis Turner-Pool/Getty Images
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How much should we worry about Islamic terrorism? How much should we worry about other kinds?

There's no exact right answer to this question. Who is out there in dark places plotting murder most foul? We can only guess, using imperfect information. Of course, there's "imperfect" and then there's downright distorted.