An enormous reach. Glocks are extremely popular, so the "make" of pistol is perfectly reasonable given their popularity. Maybe if they were in fact using the exact same model used in the shooting it would look worse but they aren't. (in fact they can't even get the caliber right in the 2nd paragraph as they list both .45 and .40)
For an analogy it's like if Giffords had been run over by a Ford Ranger and people getting upset that they were raffling off a Ford Explorer. Same "make", not the same thing.
I will concede they probably could have avoided much of this by going with a nice rifle or shotgun though.