Over the past four years, many Americans forgot how it felt to have a president who preached and practiced basic decency. Joe Biden’s inauguration on Wednesday changed that. We’re hearing a normal president say normal things. And as we hear them, the perversity of Donald Trump’s behavior stands out more clearly. By traditional standards, Biden’s inaugural address was unremarkable. But when you compare it to the twisted farewell speeches Trump delivered on Tuesday and Wednesday, it’s shocking to remember that for four years, Trump was the president of the United States.