It’s not always a good idea to run towards disasters. Untrained personnel can just lead to more people to rescue or take to the hospital.
However, primarily, I think the people in the truck are traumatized and in an adrenalin rush. They aren’t trained first responders and they don’t know what to do, so they are still freaking out to avoid what movies (and reality, to some degree) have shown them could be an exploding car.
They may well have gotten out of the car after the video.
