Wearing a helmet in a steel cage seems kind of redundant. Wearing a helmet walking at 5 km/h pace, likewise. I am wearing a helmet commuting daily, travel speed around 30 km/h. If you don't want to destroy your haircut, fair it's your choice.
Edit: To be clear, I was riding years without a helmet until a crash made me reconsider my priorities. Also, I am not in favor of mandating helmet usage on bikes.
Edit: To be clear, I was riding years without a helmet until a crash made me reconsider my priorities. Also, I am not in favor of mandating helmet usage on bikes.