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It's not bullshit. You appear to misunderstand what they're saying. Not everyone who has CTE will suddenly behave insanely. It's just that it greatly increases the likelihood of that sort of behavior. Where did you gain this misapprehension that doctors/researchers have forwarded the argument it is the sole contributor? Nobody has ever said that.I'm not disputing that. I'm taking issue that it is the sole factor making guys go crazy. I bet every HS player to the NFL has CTE. Yet they are all not losing their shit and acting insane. Every time a NFL player acts out there are people saying "oh it's CTE"
That is what I doubt.
CTE is an umbrella term. Not all CTE injuries are the same, or affect the same areas of the brain. Contrary to what you seem to believe, yes, not only have we deduced a statistically significant correlation between CTE, generally, and more violent behavior or outbursts, including self-harm, but we have mapped how specific areas of the brain that are sometimes affected by CTE have a causal relationship with changes in behavior and personality.
One of my friends in my 20's got hit by a car. Nearly died. The dude was the most laid back, carefree, happy-go-lucky stoner type you'd ever meet. Nothing ever upset him. He was gregarious, always wanted people around. He was outgoing, charismatic, very talkative. After the accident, he became a bit of an asshole. He was irritable, moody, reticent, and prone to outbursts. He became reclusive. It was so sad. Now, what he suffered wasn't CTE, because it wasn't chronic, but the injury to the portion of his brain that contributes to those traits is also sometimes affected by CTE.