well if the vehicle was in their name, which i assume it was, it would give them perfectly good reason for to sue them.
if it was in their name, then they are legally responsible for it and the drivers behind the wheel, therefore making them legally responsible for the death of the 4 passengers.
if you the passanger in a car being driving on the street, and the driver does something stupid, you can sue them quite easily
but if your the passanger in a car thats breaking into a restricted area to do something like this, it can EASILY be argued that you probably had a chance to get out of the car, unless the gate was open and the driver just turned in and gunned it down the runway
so basicly:
easy entry to location: might be a lawsuit
car had to stop so location could be broken into: lawsuit failure due to oportunity to step out of car