Why is Musk giving the jury so much of his origin story? Though he may be, depending on the day, the world’s wealthiest individual, Musk suggested that all of his business ventures were concerned with the well-being of humanity. Rocket company SpaceX was founded as “Life insurance for life as we know it”; electric-car manufacturer Tesla was started because he thought continued reliance on fossil fuels “could be pretty bad for the environment and humanity as a whole.” (On the stand, he dubiously claimed that he founded Tesla.)

He said that he has been worried about AI in his college years, that it could be a “double-edged sword,” one that could “solve all the diseases and make everyone prosperous, or it could kill us all.” He suggested that AI had two outcomes: the utopian Star Trek one, or the dystopian Terminator one. He wants the future to be more like Gene Roddenberry’s and not like James Cameron’s. This was his intention in cofounding OpenAI.

Musk cast himself as a hero — the good guy who cares about humanity, suggesting that Altman is the opposite.

It could prove to be an effective strategy, especially when contrasted with Altman, whose background cofounding the long-forgotten social media app Loopt and his days as a partner at Y Combinator might sound far less magnanimous.