Kamikaze drivers kill other drivers on purpose, otherwise they'll crash they car against a wall or down a cliff. Moreover, many of them have been reported to even aim their car against other drivers that were trying to skip them.
So, as I said in my last paragraph, probably many of them use a car because they don't have an aircraft.
Anyway, I think this is pointless in any case.
these experts do now
to fill yellow press pages, it is impossible to predict whether somebody could do something like this, in the same way suicidal drivers aren't detected a priori neither. So instead of looking for the perfect and impossible psychological test, just keep always two people in the cockpit.