Not matter what state the poor girl was in, he shouldn't have given the all clear! The guard had no idea what that girl had been up to that evening. All he cared about was getting the train away. Safety of customers should have been his priority, something which he sadly and regrettably ignored.
To be fair you don't know that, unless you we there at the time? You can't go on everything you read in the press. On countless occasions I have seen people approach my train after it has started moving, often trying to open doors as they missed the train. I have witnessed people running up to the train with such fore they have run into it as it was moving.
As I said before, the court has ruled what it has ruled but none of us truly know what happened and it is in very bad taste to have this kind of discussion and is really bringing out the evil in people.