Allow me a moment of personal indulgence: When I began writing a column many years ago, it quickly dawned on me that although I had strong and firm views on some things, there were many others about which my opinions weren’t fully formed. I believe that many of us have areas in our lives where our opinions are fungible. It was only through my experience in this job that my own opinions became so clear to me. Doing the job honed me, revealed me, exposed me.

I believe that something similar, but on a much grander and much more consequential scale, happens with presidents. As Michelle Obama said: “Being president doesn’t change who you are. No, it reveals who you are.” That is what is happening with Donald Trump.

He has in the course of his life been on all sides of many issues, although he was always a liar, bully, misogynist, opportunist and economic isolationist. But his racial hostility and white supremacy seem to have blossomed with his entry into politics and his Russia-aided election. After spending a life catering to the appetites of the greedy and gauche, he realized that there was an exponentially larger market of white nationalists and neo-Nazis. To the aspirational he could be landlord, but to the racists he could be overlord.

Trump’s outrageous decision this week to end DACA, the Obama-era Deferred Action for Childhood Arrivals, which allowed many young people brought to this country as children to stay and work here, is just the latest expression of Trump’s growing intolerance and his growing adoption and internalizing of white nationalist ideology.