"QF's only legal response was a lockout and, although it was a last resort, we had to put measures in place which enabled such a course of action to be effective with minimum inconvenience to the customers. As per Mr Joyce's testimony the final decision was not taken until the Saturday morning."
That's kind of like a hitman who buys the ammunition, drives to the murder scene, loads his gun, waits 4 hours for the victim to arrive, shoots him in the head and then pleads it was only manslaughter because he only decided to pull the trigger in the last 10 seconds.
And besides, on how many other occasions had they planned for such "contingencies"?