Psyops. The 'crazies' only ever attack other civilians, and simply by the odds, we know that is statistically improbable.
Discussion
Hmmmm.
Agree, I think there's a lot of LIHOP, and quite a bit of MIHOP.
But our data set is surely incomplete.
There may be many plots to kill decision makers where the plotters never get the right opportunity. And other plots are thwarted but reporting on them wouldn't suit the narrative, so the perpetrators just end in shallow graves in the desert etc.