Historically, America was an evangelist for liberal democracy, free trade, and the international rule of law. In spite of many mistakes, in the big picture, it has worked. The world is a far more peaceful and prosperous place than it used to be.
To our critics on the right (Putin) and left (the authors of the 1619 Project), this is all self-serving eyewash. America is only about racism and power and self-interest. We delude ourselves when we think otherwise.
Trump basically agrees with the critics. Worse, he actually goes further and openly embraces the critique. He makes the case against us every day.
And that, among many other reasons, is why he has to go.