I always wear a helmet and I don't understand people who don't. It is just stupid. You never know what can happen on a 1000lb animal of prey.
Riders need to wear helmets whenever we work with a horse. I'm delighted to see that more riders are embracing the new USDF rules about helmets. I have had some close calls while riding and even hand-walking my horse. But I can write this comment because I had a helmet on at those times. Believe me, a "bad-hair day" or "helmet hair" isn't nearly as devastating as not being able to ride or be with a horse, at all!