Poorly disciplined shooters is more than good enough reason for anyone to want to wear a vest at the range. I say wear it if you got it.
So some back story.
I knew someone who was murdered at a public gun range by an unsupervised mental patient with a rental. Guy heard the range officer on the loud speaker ordering the other shooter back to his station enough to turn around and face his killer. 20+ shots into his corpse later, his killer shot himself in the head twice.
Later in life, the range I went to periodically had an attempted suicide by cop/range-employee. He turned his back to the range employee and the range employee interrupted his plans in the shoulder, eventually giving up his m1 carbine to the police after they shot him with a bean bag round at close range.
Combine things like these with negligent behavior and signs of historical ND's into the furniture, I added a vest to my kit of safety equipment.