Earlier quoted context omitted.
Hm, is it true that everyone with CTE dies "horribly"? I think that might be overstating things a bit.
Not every single person with CTE dies horribly. As I understand it, some simply live decades happily forgetting their children's names and what day of the week it is.
Senile dementia, Alzheimers, brain cancers, and TBI frighten me even more than being flung 100m across the pavement in an automobile accident, or getting dragged into the gap by a commuter train. With those, you know you're dead, and so does everyone else. When you slowly lose your mind, no one can ever really be sure when you stopped being you, not even yourself.