That is absolutely a contributing factor....
Been there done that!
It's been years since I rode but I always wore a full face helmet. You only need to slide once on your face to learn to appreciate the protection of a full face helmet. I actually snapped the chin piece off my helmet trying to do a handstand on the handle bars.
I dont ever recall being asked to take off my helmet,but things were much different back then,no CCTV for sure.
I've actually been toying with the idea of building a bike,how does a bigbore single enduro turned into a bobber style sound? Wanted to use an old airhead BMW but the cost of a reasonable starting bike has gone through the roof. Been looking at 650 enduros instead,one of those 800 cc BMW's would be nice but again the cost is more than I can justify.