> Also, markets price in these sorts of things.
Markets price in the expected value of them, but since if divestment works, the impact is driven by the funds-available-for-investment weighted aggregate of public opinion, markets can only price it in if they have advance knowledge of both the content and wealth-distribution of future public opinion. Which they obviously don't.
(Even if they did, all this would be saying is "if divestment works, then it not only works but works retrocausally to reduce the stock price even before the decision to divest occurs." Which, whatever it is, isn't an argument against divestment.)
If divestment was a real threat, that would already be factored into the price.