I don't think you know the whole story and you think you know what happens inside peoples heads. Steve jobs had pancreatic cancer with a 5 year survival rate of 10% for eight years, he already beat the odds. He had a kind of cancer computer fabricators got in the 70s and ravaged grey beard engineers across silicon valley.
You really have no idea what you are talking about, what it is like to be sick and what chemo does to you. It is their right not to seek treatment and to go out with dignity if that is their decision and that doesn't make them a moron.