On a ride once we were passing through a dangerous area close to a township minding our own business when a bunch of a-holes in a car started to deliberately mess with us. It was starting to get dangerous and things were going South in a hurry when one of the guys (he shall remain unamed) zipped open his jacket and reached inside as if going for his piece.
Never saw a golf take off so quickly before

Point is that in that case it served as a deterrent and got us out of a dangerous situation.
I have also broken down, or even just stopped in the sticks and before long someone or a group of misfits comes cruising past. Many times I got the vibe that I was being weighed up and that they wanted to jump my bones. The fact that I am big, fat and generally mean probably counted in my favor.
Maybe it is only a Gauteng thing-who knows. I would, however, rather have an option than just hope for the best.