I'm not going to lecture anyone. I will, however happily show my shattered lid around. You'll note that I said I'm trying to convince those I know who don't wear helmets. That does not refer to the internet at large. There's no point in convincing anyone with whom I do not have a relationship of anything.
Are they on here, then? Because to post on a forum is to address the membership. Besides, I'm not sure the advice is significantly less patronizing or useless if directed at friends and acquaintances than at strangers.