What is so difficult here?
a) Photographers perform a neccessary service.
b) Soldiers perform a neccessary service.
c) Both were trained to perform that particular service. Photographers were not trained to point a gun in the right direction. They were not trained to close a wound. Soldiers were not trained in lighting and shutter speed.
d) Just like soldiers, photographers get paid for the particular service they were trained for.
e) Just like soldiers dropping their weapons to pick up cameras, photographers would be equally useless if they dropped their cameras to pick up weapons.
f) Just like soldiers, photographers do not return to their Manhattan penthouses.
If something's troubling you about all this.... it's in one of these points probably. Which is it?