Its a great shame what happened!
LJLA has 1 security officer outside the terminal 24/7 with 2 others patrolling. Where the hell the security guard was while it was all happening I will never know. He is said to be a 'key witness' to the events tho, and the CCTV from outside the terminal has been handed over to the police.
This happens at every UK airport, people get out of the car to do the cases and leave the car running, so the lesson from this is to not leave your car running.
Hopefully these events wont reflect at all on peoples opinions of Liverpool or the airport.