Shouldn't we wait for all the details?
What happened is the Italians made a grave mistake. You don't proceed in the night speeding towards a check point without notifying someone what's going on. All the necessary warnings were given and they still speed towards the check point.
why are they so trigger happy? Because it has been a common tactic of insurgents to do the same when trying to kill people at check points. They shoot at the car not the people, what more would you except?
What if it was insurgents and they didn't stop the vehicle? Someone then would have been charged with dereliction of duty and be facing a court marshal.