In his new documentary, "Musk," filmmaker Alex Gibney set out to answer two big questions about the world’s first trillionaire: How has Elon Musk assumed so much power, and why have we given it to him so willingly? Over nearly four hours, the film connects the dots between Musk’s various ventures — SpaceX, Tesla, Starlink, X, xAI, and Neurolink — to tell a bigger story of the unique threat he…