Take the issue of type: The victims shared neither sex, race nor age group, and this has led to a general declaration that they shared no characteristics at all. But they did: They were all Americans, engaged in the typical American activities of pumping gas, going to school, shopping, etc
They were all non-Moslems. They were all kaffir infidels. None had olive skin. None wore the hajib. Coincidence?
More than one were Black.
I believe some 30% of Americans Muslims are black.
You're right, the author left our that salient point. And the fact that there's a huge Muslim population in the area of the murders makes it all the more "coincidental" that that group wasn't hit.