Thompson, that vidclip in Melbourne was filmed 20-odd years before helmet-wearing became mandatory in Australia for cyclists!! (apparently a world first?!)

I didn't realise that it was still a controversial idea, but Wiki says :
"Studies of helmet use by injured cyclists were published from the late 1980s, some in Australia, both before and after helmet legislation. These have concluded both for and against the encouragement of bicycle helmet wearing and/or bicycle helmet legislation – the debate continues, without consensus"   : https://en.wikipedia.org/wiki/Bicycle_helmets_in_Australia

Cheers, R-J