WASHINGTON — Every scene in “Lawrence of Arabia” is perfect, but there’s one I find especially haunting.

Peter O’Toole’s Lawrence returns to Cairo after successfully leading the Arabs in battle against the Ottoman Empire and tells a military superior that he does not want to go back. Slumping in his Bedouin robes, looking pained, he recalls that he executed an Arab with his pistol.

There was something about it he didn’t like, he says.

The irritated general tries to brush it off, assuming the erudite Lawrence is upset at killing a man.

“No, something else,” Lawrence explains. “I enjoyed it.”

The first time I realized that Donald Trump took pleasure in violence was back in March 2016. In an interview, I asked him about the brutish rhetoric and violence at his rallies and the way he goaded supporters to hate on journalists and rough up protesters.