Don’t fall for the great man fallacy, nor its opposite, the villain fallacy. It’s just oversimplified media narratives.
Most people are complicated.
It's not because he knew better, but because he didn't like it. And frankly, who can blame him? The survival rate from pancreatic cancer is quite low, as is the median life expectancy. Moreover, he had the misfortune of getting a more aggressive variant. And the treatment is quite heavy.
Nevertheless, if it was me, everything considered, I'd still try to take my chances. And I believe most people would do the same. It's a pity, because there is still some chance he could still be around.
Also pancreatic cancer that was likely comorbid with his dietary choices, to begin with, so it's not just about the treatment of choice.
Judge people by actions not words.
I'm not a doctor, but I've dealt with a looot of oncologists, and with people at the end of life from cancer. Most cancer docs would choose to go through with far less cancer treatments than their patients typically choose.
I could be wrong, but I thought the operation was a Whipple procedure, and the concern I lay out is that the operation is not easy.
I'm not a physician, either, but this rings true with experiences from my own life, were people I knew who were doctors decided early to stop treatment and let the disease run its course (and subsequently passed away).
See https://hms.harvard.edu/news/how-doctors-die - "Physicians are less likely than the general population to undergo intense end-of-life treatments"
https://www.cnbc.com/amp/2015/11/12/hospital-where-jobs-rece...
Whether plutocracy is a good, never mind ideal, way to organise a planetary culture is very much up for debate.
Which other every-day mechanisms results in the death of one of two parties?