Are the students in that picture not aware of their targets and what is around them? I'd say they are acutely aware.
The guy with the camera is not a target and he is not a threat. So discharging a firearm around him is not acceptable.
Others have stated here that they find this acceptable but would not want to be the cameraman. If you are not willing to be the cameraman that should say something about this situation.
I was reminded of this by the story of William Tell. Forced to shoot an apple off the head of his son. Two arrows stuck into the ground before the shot was taken. The second arrow to kill the man who forced him to do this unsafe act. If an archer of William Tell's ability knows better than to do things like this we should know better than to be down range between targets in front of a group of students.