I was in Germany at that time. I remember the Bundesgrenzschutz patrolling the airports with their MP5’s, a pistol, and 90% of the time with their German Shepherds (and they weren’t drug dogs). Talk about a deterrent. Between them and the Polizei, there was enough firepower only a mad man would try something. These were highly trained professionals. The BGS was almost another branch of the Military, and still provide special forces units.