A discussion doomed to be the tenth circle of hell, unfortunately.
I have yet to be convinced that cyclists who do not make an effort to make themselves seen or do not make a effort to wear head protection
A little less judgement and assumption would be helpful to a civilised and rational debate.
In NL practically no-one wears a helmet, with the possible exception of roadies - and I'm not sure that it isn't seen as part of the uniform as opposed to a safety device. Are millions of people not making an effort every day?
I wear a helmet when I tour. The reason for that is that I never quite know where I will end up or on what kind of a surface. It has protected my head - but not perhaps in the way envisaged. Low branches and low doors (in places where I am considered tall) the most obvious ones.
I cycled many thousands of Kms in NL without a helmet.
Now, if I want to go out on the bike a helmet is mandatory. (Spain). I do not agree with mandatory helmet wearing.
Perhaps you mean "in certain circumstances" it's advisable to wear a helmet?
I have also been nearly hit while wearing high Viz and fully lit up. Anecdotal perhaps, and I tend to agree that it's beneficial in a "big picture " sense but it's only one part of a large and complicated picture.
It is NOT my responsibility to ensure drivers are paying attention in their mobile living room!
While I agree it's not your responsibility, you will be the one to suffer for a lack of attention.
There are many things we can do to improve the situation such as campaigning for enforcement of the laws, new laws, education etc.but also simple, practical things on the bike, observation being the most important in my opinion.
The thing is, this car/driver vs cyclist/person on a bike is only significant in certain places.
A more interesting discussion could be had on why that is.