I call straw man on that comment
"The argument that non helmet wearers are not at risk because they are safer riders is rediculous"
If it is such "obvious" FUD then please give your reasoning; don't just oversimplify and misrepresent an entire detailed argument with one false statement and expect people to take it as read. To me it's far from obvious that there is any FUD going on. They're not against people choosing to wear a helmet, they're just pointing out that helmets are a lot less likely to save your life than you have been told they are.
Just because police/paramedics told you that the helmet saved your life doesn't necessarily make it so, but if you choose to believe their word then that's fair enough. I work daily with paramedics and ambulance technicians and I know for a fact that technical training on the efficacy of cycle helmets is not a part of their professional education, and I very much doubt it comes into police training either. So what you have been told at the scene is based on the same assumptions you yourself are making, and does not prove a thing. The bottom line is these people do not have the knowledge any more than you or I do to say for sure one way or the other (but they did anyway) and the split helmet "evidence" is anything but.
One of the most telling comments I have heard from a paramedic was that "pedestrians should be the ones wearing helmets" as walking down the street/crossing the road is orders of magnitude more dangerous than riding a bike. My point is not to say "this is the reason why helmets are pointless and people shouldn't wear helmets" (far from it, it's a personal choice) but that non helmet-wearing cyclists shouldn't be vilified for their "idiocy" any more than non helmet-wearing pedestrians.