At one time, I thought maybe Musk's brain was a victim of some microwave brain->mush weapon or something. Then, I thought it was all about when he went from not realizing his gains to getting the biggest single pay day in history, and having to write a multi-billion dollar tax check that fried his brain.
In the most recent years, I thought that he flipped personalities, and somehow became an easily influenced person for some reason [0], who might believe things that a person like Sacks tells him.
When he gave a Nazi salute to the world, twice... well, it doesn't matter what my theories were anymore. There is no denying exactly who he is now.
I still wonder, was he always this person? If so, top .0001% acting skills.
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[0] Ketamine as a Possible Moderator of Hypnotizability: A Feasibility Study