You've made a lot of good points, though we're gonna have to agree to disagree. I occasionally wear IEMS (actually not anymore since I replaced my helmet and can't comfortably fit them with the snugness of the new 'un) where and when I feel it is safe to do so. Riding a motorcycle is vastly more risky than driving a car. It's not a justifiable choice, but a calculated risk that some people find to be worth the risk. Personally I find ambient noise to be of vast benefit in traffic/burbs riding, but somewhere between useless and a liability on the open road.