You do realize that this doesn't actually do much for your argument.  It is a bit like lab coat syndrome, the way to deal with it is to take your own blood pressure regularly, so that it becomes a very normal activity.  Wearing a helmet all the time does the same thing.
If people always wear helmets, they become an unconscious part of skiing.
People who wear helmets are MORE aware of their own vulnerability, but they also tend to be better and more serious skiers.which means they are taking bigger risks.  They are safer wearing a helmet
If you are skiing an exposed 45 degree line and a ski pops off, you might well hit your head on a rock.  I would prefer having a helmet on my head.
While helmets might not always save you, they definitely help.
Also, if you ski differently wearing a helmet that is YOUR behavior which increases the risk, not the helmet.
When I read arguments like yours it makes me wish that people without math/stat backgrounds would just not even bother trying to interpret data.  They always seem to come up with silly self-serving conclusions.