Why are you in favor of poverty and global warming, and against asteroid mining and starships? There's so much more you can do while you're alive than you can do while you're dead; and attempting to extend your time alive does not preclude enjoying it.
We hate cancer because it takes from us those who wish to give so much without consideration. An indiscriminate killer that wastes our treasures away before our eyes, leaving us with only memories, partially realized dreams and the rage of "why now, when there was so much more good to be done?!"
Sure, you may not want people to live forever, but that has absolutely nothing to do with the above comment; indeed, what you've said might be viewed as somewhat callous when considering the context that someone has revealed that they have terminal cancer.