Insider trading is corrupt and all, but can we talk about the suckers who panic-sell/buy when Trump tweets anything?

> "We have had very good and productive conversations"

This is literally all that Trump said. Why should that move markets?

If you're a long-term investor, you shouldn't care about Trump's latest Tweet, and you won't get taken advantage of by insider trading. I'm not sure who's getting rekt on this constantly and still thinks it's worth panic-selling when Trump tweets.