Hit your head once severely recently? Took a fall several times with only minor dizziness and got back up to resume your physically demanding activities? Has your personality and ability to make rational decisions and resist impulses changed as a result of these head bangs? Many competitive athletes must risk the repercussions of moderate and grave wounds in order to do what they love professionally.
Lives can be lost, hopes can be crushed, and existential purpose all but torn asunder. The one respite is to the pursuit of knowledge to so that future injuries sustained by anyone can be addressed with more certainty and accuracy.