Another reason is, security checks are just one part of the whole process involved. A flight with 100 people dying because of a bomb may be more “glamorous” tha

Another reason is, security checks are just one part of the whole process involved. A flight with 100 people dying because of a bomb may be more “glamorous” than 200 dead on a train to a terrorist organization. Also: the actual number of such people/organizations, is, fortunately, extremely low in daily life.