Well, my partner fractured her skull doing ice dance. Worst still, it wasn't even a tricky move. I know a few other skaters who have also fallen and cracked their skull. Some of these now do wear helmets and I find that perfectly understandable, although I've never worn one myself. There are several reasons for that:
1. Not convinced that the existing helmets are appropriate or adequate. Having said that, I guess that something is better than nothing. I'd be happier if what did exist had some level of test certification, but it needs to be 'good enough' rather than over-engineered for safety.
2. I would consider something like a 'halo' or one of the other head guard designs, but not something that looks like a hockey, or cycle helmet, or some army surplus.
3. I suppose my risk assessment based on my personal experience is that the risk to me, although not neglible, is sufficiently low.
If I was practicing some free dance moves, or pairs, then I would seriously consider something. The DOI 'head banger' says it all.
I'm not convinced that the false sense of security argument about a head guard is a valid argument against head guards. It's like saying that we shouldn't have seat belts because it makes a few drivers drive beyond their limits.
I think that head guards for ice skating will go like cycle helmets. Very few people used to wear them. Lycra and helmets then became part of the cyclist's uniform. If they look fashionable then they've got a better chance of take up.