You do realise that an equal number of shares have been sold as have been bought, right?
It's very simple: the market is pricing in Trump becoming president and the collective estimate of this is that Tesla as a company is worth less, reflecting an expectation by the market that Tesla will be less profitable in the future than what the market expected before the election.
This could be because of specific things Trump says he believes and intends to act upon: climate change scepticism may adversely effects incentives for cars and solar and negatively effect legislation nation wide with regard to Tesla's businesses, Trump ideas on foreign/global trade may harm Tesla's global business.
Thank you for correcting me. Yes I do realize an equal number of shares have been bought and sold. I should have phrased my point more accurately, that being that I find a lot of us here over-analyze share price movements, and I find most blame "coordinated" attacks by shorts. I simply do not share this view.