Correlation certainly does not equal causation, nor does it imply responsibility for all cases of Parkinson's. Even considering causation as an option, stating that head trauma caused Parkinson's in specific cases does not imply that head trauma is the *only* cause or risk factor for Parkinson's. It is a neurodegenerative disorder that probably can be brought on by a number of causes and affected by numerous risk factors. One of which seems to be head trauma. Which, to me, seems perfectly plausible that neurological trauma could potentially lead to a neurodegenerative disease down the line.
Science is awesome.
Are you saying that there could be more than one factor which causes a particular disease?
That's just crazy. Everybody knows that degenerative diseases like cancer, Alzheimer's, Parkinson's, or CTE have one cause, and one cause only.
Which is why they're so easy to prevent. Oh wait...
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