Could it be because among affluent, environmentally conscious consumers, it's no longer cool to be driving a car made by an unhinged right-wing narcissist?
Musk said on the earnings call that his concern would be, given his current shareholding, that he will have "so little influence" in the future that some major shareholder could strip away his control or make a bad decision.
Or could it be a consequence of dumping shares to fund a megalomaniacal need to own a social media platform?