When Gary Johnson had his Aleppo moment a week ago, I was among those who could not believe his absolute incompetence. I understand that Libertarians generally take an isolationist position when it comes to foreign affairs, but it was incredibly troubling to see someone who thought he was fit to lead this country show such a lack of interest or inquisitiveness.I’m writing this week’s column from a cafe in Piazza Barberini. After the Aleppo incident, I will not assume everyone knows that Piazza Barberini, at least the most famous one, is in Rome (and, just so we’re totally clear, that’s Rome, Italy.)Earlier today, I spent many hours walking through the Roman ruins.