Professor Andrew Holt lays out why the coding criteria, and thus, the comparisons are apples-to-oranges:
The problem with this source, as I see it, is that the count is wrong.
In International Security’s listing of the 45 deaths due to Islamic extremism, they attribute them to only nine incidents since 9/11. These include the more well-known attacks, such as San Bernardino (14 dead), Chattanooga (5 dead), Fort Hood (13 dead), the Boston Marathon Bombing (4 dead- with 264 additional casualties, I might add), as well as the Washington and New Jersey killing spree (4 dead), but also the Oklahoma beheading of 2014 (1 dead), the Little Rock Shooting of 2009 (1 dead), the Seattle Jewish Federation Shooting of 2006 (1 dead), and the Los Angeles Airport shooting of 2002 (2 dead).
So this is where they stop, but if we are comparing Islamic extremism to right wing extremism, apples to apples (and, to give credit to International Security, they acknowledge this is subjective on their website) then there are several others incidents that should be included in this total.
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