Regarding helmet use: it is all very well to preach consistent helmet use but consider this - a guy I know was hiking up the trail to Castle Crags and fell down on some scree. Hit his head and damaged brain, was a wheelchair driver for several years, has now regained partial functioning of legs. Also part of face paralyzed, slurs speech, people assume he is retarded although he isn't.
How many "I always wear a helmet" people wear their helmets on the approach from the parking lot consistently? I guess not many. Point being the helmet can be an annoyance and of minimal benefit in some situations; choosing where to put on the helmet should be a personal decision not some mandatory requirement.