Re:
I get the whole "better with than without" and "safety first" etc. but... i do have some doubts about cycle helmets, they are pathetic compared to say a motorcycle helmet. My motorcycle helmet weighs 1,300g, has sophisticated construction and is quite obviously capable of significant protection including ears etc and will stay put during a nasty slide across tarmac. Bicycle helmets are a joke by comparison, not useless i concede, but much less secure etc for sure.
I do wear a modern cycle helmet all the time so don't go lecturing me about it. I also only ride motorcycles with full rider gear, not just a helmet and t-shirt.
I suspect a cycle helmet is better than nothing, but only just. I firmly believe one's welfare as a cyclist is best served by skillful roadcraft (positioning, looking, judging speeds, reading the road, lifesaver glances etc) rather than plopping on a helmet and thinking that makes me safe on the roads. A cycle helmet might be a bit better than nothing but good roadcraft is a LOT better than nothing.