As a reply to both of the above, I'll mention that I don't consider myself any kind of magician on the bike. I'm merely competent, at least on a road bike, and that doesn't seem like a unattainable standard. I also have never claimed that I will "never" crash. I have merely claimed that I am pretty unlikely to, and even if I do, I am very unlikely to strike my head. Again, this is claimed on decades of experience.

It is akin to claiming that I do not need a helmet while walking, because even though some people do fall and strike their heads while walking, it has never happened to me and is pretty unlikely to in the foreseeable future. That does not make me some kind of incredibly talented walker...