Musk is a fascinating example. Incredibly hard working, visionary, detail oriented. Without him we'd probably not have had reusable rockets for another generation or more. With Tesla he also accelerated electric car adoption. He was also brutally honest about their chances of success, when pitching SpaceX to the other initial investors he gave it a 10% chance of success. He was little more confident about Tesla, saying the main objective was to prove the concept and push adoption across the industry. Yes he's famous for giving absurdly short time scales for advances like "full self driving", and this is reckless and irresponsible, but I think he genuinely believes what he says at the time.

Yet he's also a sociopathic fascist arsehole. It turns out these traits are not all on the same axis.