I think my answer would probably be "All of the above".
The questions you have raised seem to cover the different frameworks of knowledge, interest, equity and utility. I can relate to all of them. I guess, though, your point was to get people to think about which one is a 'driver' for their behaviour.
So, if I had to choose:
I would go with what I have knowledge of, which is "my cancer experinece". I can get passionate and desire equity in matters to do with cancer research, treatment, support, etc, but they are always going to be informed by my own knowledge. I am not a professional advocate and I could only act on what I have knowledge of at the time. I am not looking to be an advocate, although I might advocate.
And I'm also aware that not everything can be fixed so there's likely to be better returns for some investments compared to others, etc, etc, etc...(insert standard economic rationalist argument here).
So, Eddie, I'm picking answer 1. Did I win?
Samex, my behaviour prior to diagnosis was as gender typical as yours, I guess. My wife kept saying you should have a check up and I kept avoiding it because I didn't want to know what I might have to know...typical blokey response to the situation.
H