Its 'Elf & Safety' innit
Yes, there are sensible rationalisations for this, but is there any evidence that it is actually needed? Just telling us it will help isn't enough. There are all sorts of essential safety gear that could be suggested - flame-proof overalls, helmets, safety boots etc etc - just in case.
The classic nonsense happened last year when an annual parade of WW2 veterans was almost cancelled because the 'Kevins' in the local Council insisted they were escorted by hi-vi wearing stewards, at ludicrous cost.
All of us when we go airside take our lives in our hands, and accept that risk. Wearing a hi-vi does not in itself guarantee anything.