According to his biographer, Walter Isaacson, around this period Musk began sending “rightwing memes and conspiracy theories” to Grimes, who replied: “Is this from 4chan or something? You’re actually starting to sound like someone from the far right.”
At the same time, his daughter Vivian came out as transgender and changed her name, declaring that she no longer wanted to “be related to my biological father in any way, shape or form”.
Musk himself has cited Vivian as a reason for his political shift, telling the pop psychologist Jordan Peterson that he had “lost [his] son [sic], essentially”, and concluding that his son “is dead, killed by the woke mind virus”.
While those might be reasons, he has claimed its because of his trans daughter. It’s a pretty disgusting stance.
https://www.theguardian.com/technology/article/2024/aug/09/elon-musks-journey-from-humanitarian-to-poster-of-rightwing-memes
Emphasis mine below