Monster Pete, I agree that this is getting out of hand. You and chasm should reread the thread title. The question wasn't whether or not to wear a helmet; it was which helmet should the OP purchase.
Buy the cheapest one on the market since none have any efficacy.
Walk out to the sidewalk, lie down on your back. Raise your head a few inches above the ground and bang it, as hard you can, onto the ground. Or, have a wrestler or judoka uchi mata your ass onto the pavement. Try it once with and once without a helmet. Tell me which one you prefer.
Walk down the sidewalk, drop a banana peel in front of you and slip and smack your head on the concrete both with and without a helmet. If it feels better with a helmet, then you should be arguing that all pedestrians wear helmets.