Trump, by most reports, has always been a vulgar and ignorant man. This creepy moment in Milwaukee will add to our national and international humiliation if he is returned to office. But more important, manifesting this kind of disinhibited behavior in public more and more often is a warning sign that he is simply not stable enough to sit in the Oval Office.

Whatever small mercies and considerations you might offer to a man acting like Trump, you would certainly not place him in positions of pressure or responsibility, or inflict situations on him in which he would be called upon to make speedy and important decisions. You definitely would not make him the commander in chief of the most powerful military on the planet and place the safety of billions of innocent human beings in his hands.

The rally crowd, ever faithful and willing to do its part, laughed as Trump pretended to pleasure a piece of equipment. But for the rest of us, the laughter has to stop, and the horror of what might happen in a few days must take its place.