I should add to my reply #22, that only the first example required the kill switch. In all others the bike turned off on its own, or was idling. Even though most of the falls were on the right side.
So to answer the question, is safety necessary, I can unequivocally state... no..

It is a matter of personal choice, let Darwin sort it out.
Oh yeah, unless someone else's negligence hurts me, then they should have been safer. I forgot that part.