How do you even stay invested with the market at the mercy of a madman's rants?

The beauty of investing in American stocks was the geopolitical stability and the rules and regulations that were pretty cut-and-dry. But now, somehow, we find ourselves in a situation where we went from "The business of America is Business" to "The business of America is whatever Trump decides." How does one stay invested in this environment when no one knows which sector this madman will target? First it was the chips, then autos, now it's housing and credit cards - which is both a brilliant and cynical move if you ask me, just like his healthcare plan. What happens once Powell is replaced by a lackey who will do whatever it takes to get to 1% interest rates? Do we hold our noses and play the volatility?