To be fair, most CEOs does that, but I think his downfall was really everything that he did besides just over-promising and under-delivering. He could have continued as-is, without all the political stunts and activities, and I'm sure Europeans would still have bought Teslas sometimes. Now the brand is poisoned pretty much world-wide, which wouldn't have happened just because of "over-promise and under-deliver", it takes a lot more for stuff like that to happen.