Yet, if you Google "turbulence" and "injury" you will find any number of incidents every year in which crew and passengers suffer anything from minor bumps to serious injuries.

People then question why the seatbelt sign wasn't on. If this were just about the individual, I would say that if you are foolish enough to stand up when it is dangerous, that is between you and your doctor. But, it isn't. It is about people who feel the need to stand up and open an OH so that they or something else becomes a projectile which injures others.