The following article by Nate Silver was posted on the fivethirtyeight website September 30, 2017:
His outburst on Hurricane Maria and Puerto Rico shows that not everything is a clever ploy to rally his base.
Whenever President Trump lashes out against someone or something in a way that defies traditional expectations for presidential behavior — for instance, his decision to criticize the mayor of San Juan, Puerto Rico, on Saturday morning after her city was devastated by Hurricane Maria — it yields a debate about what was behind it. After Trump’s series of attacks on the NFL and its players earlier this month, for example, there were two major theories about what motivated his conduct.
The first theory is that it was a deliberate political tactic — or as a New York Times headline put it, “a calculated attempt to shore up his base.” We often hear theories like this after Trump does or says something controversial or outrageous. His response to the white supremacist rally in Charlottesville, Virginia, in August was sometimes explained in this way, for example. “Mr. Trump has always appreciated the emotional pull of questioning bias and fairness, especially with his white working-class base,” the Times wrote, portraying Charlottesville as an issue that drove a wedge between the Trumpian and the Republican establishment.