I'm guessing that those statistics on accidents are pretty weak....just saying that did accidents on bicycles, BMX, off road riding go up when the athlete started wearing helmets....
AND if you are the best skier in the kingdom and never fall....I was on my first Helli trip in Whistler 2 seasons ago and I was talking with the guide when we unloaded from the copter and he said drop in behind me. Well he took off and I closed the gap and was skiing 2 ski Lengths in heavy snow 8" deep. After about 1000 vertical he decided to stop not knowing I was 2 ski Lengthss behind him making these sweet links to his turns. There was no signal or brake lights, he never turned around to look behind him...he just pulled up and stopped...in 8" of heavy wet snow....he stopped and I skied right over the top of him. Fortunately he was not injured but proceed to say he had been guiding for 18 years and has never been hit or fallen....well there ya go....you Can get whacked from behind, or even standing in line. At least the helmet offers some protection, for sure some warmth....
But hey....I wax my top skins so cleaning up after any disaster is as easy as rinsing them off.

I hope to keep skiing for many years to come and protecting my noggin just might afford that pleasure...well at least for me, Svend, John, Jim and Ron.....
Not suggesting it should be law..just ...if it just makes sense....but hey....that's for each of us to figure out, why, when and where!
Best,
G