I don't see why they should get heated. I wear a helmet whenever I am on my bike, does it make me better than those that don't? Certainly not. I choose to wear one, others do also, others choose to not wear one. Why is that so difficult for people to comprehend?
They always get heated though . The way it goes is that without fail someone will post on here that they are related to someone who works in A&E. That person in A&E is then an expert in head injurys and cycle helmet design and then before you know it they will say that non wearers are negligent. A couple of people will then post stories of how a helmet saved their life because their helmet broke into 100 pieces and before you know it it has turned into world war III.
At least this thread has not gone that far yet but I am sure it won't be long.
I don't wear a helmet and I have no problem with anyone that does, each to their own.