I speculated a short while back that with Musk’s true dream of immortality seeming less plausible every year, he has turned his sights on being remembered by history.
I think I was right, and some sort of drug fueled edgelord logic has led him to conclude that fear is strong and universal, and being a cacking villain gets your name to “stick” with people the most.
Or his ridiculous luck has given him the world’s worst case of Main Character syndrome, and the game play that amuses his fried brain involves griefing the NPCs.