Sure. But your point was that discouraging helemt use would discourage cycling, remember? No evidence for that.

You're beginning to bore me, I'm afraid, because it's clear that your purpose is nothing more that juvenile oppositionalism. If you want me to agree that the evidence on the efficacy of helmets is inconclusive, fine. I admit it. But that is my point, you see? The metadata suggests that helmets don't reduce the incidence of serious injury. Individual studies are equivocal, but some suggest reasons why helmets might be less useful that most people suppose. Plus I can break a cycling helmet in my not-terribly-strong hands. Wear one, it's fine with me. But all things considered, I don't think you have the evidence that would justify you in compelling me to wear one.