I'll have to disagree with you here on both counts.Put on a full face helmet that highly obscures your peripheral vision and badly restricts your hearing, then tell me you feel safer from the auto drivers?
1. At speed wind causes your eyes to tear up and can be quite blinding. A well designed helmet does not obstruct your peripheral vision and can actually aid your vision.
2. While it may be counter intuitive, I know from personal experience that I could hear much better with a full face helmet than without one. Think of the effect as a wind screen on a mic when using it outdoors.
Of course, I agree no helmet is better at low speeds cruising around your neighborhood, but unfortunately too many people don't have common sense which is why we have laws to protect us and them from themselves.