> On the other hand, it feels... strange somehow that a joke (if a slightly deadpan one) has consequences this severe. It affected the markets and it obviously wasn't without real-world consequences in any case, but something about this all just feels a little off somehow.
If it was legal to do stuff like this there would be a lot more stock manipulation than there is now, which would make the market worse for investors.
The point of these regulations is that investors should have confidence that the price of a stock is based on the market's estimation of its value, that relevant information has been disclosed to the SEC, and so on. If people could not assume those things, investor confidence would decrease, and that would hurt the entire market.
I also don't agree that Musk saw his tweets about Tesla going private as a joke. He made enough tweets that it affected the stock price. A CEO of a publicly traded company ought to know better.