President Trump is on the fast track to impeachment — all right, yes, it’s not really all that surprising. But when you think back over the past four years, don’t you feel your breath catching in your throat, your eyes widening, your mouth falling ajar as you contemplate the amazing fact that Donald Trump ever became president of the United States, and thus, liable to impeachment?

I’ve literally lost count of all the moments at which I thought well, he’s done it now, no campaign could possibly survive that unforced error. Starting in July 2015, when he said of John McCain, “He’s not a war hero … I like people who weren’t captured.” This from a man who’s certainly no war hero, in part because a friendly podiatrist secured him a draft deferment for (apparently evanescent) bone spurs.

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Americans don’t like anyone who impugns the honor of the nation’s warriors, especially not anyone who avoided service and is insulting a warrior who spent more than five years being tortured by the enemy in a notorious communist prison camp. Obviously, the Trump campaign was over … er, I meant to say, just begun.

There was still plenty of time for Trump to attack the parents of a dead soldier, to claim that judges of Mexican ancestry shouldn’t be allowed to oversee the trial involving a class-action lawsuit over his now-defunct Trump University and, in a hot-mic recording, to be revealed bragging about groping women. There was still time for reports about Trump routinely stiffing small vendors, for the clip of him discussing his own daughter in a salacious radio interview. And, gosh, that’s only the very craziest, most indisputably unacceptable stuff that happened before commander bone spurs became commander in chief.

How could any candidate have survived just one of these thermonuclear scandals, much less all of them? Trump must have had some previously undetected superpower — and in reality, he does, a quite obvious one: a perfect lack of concern about anyone except himself.

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A normal person, possessed of a modicum of empathy and a healthy capacity for shame, wouldn’t have done such things. But if a normal politician had somehow done them, and gotten caught, he likely would have slunk away, withdrawing partly to avoid further public shaming but also to shield innocent bystanders — his family, his party — who would otherwise suffer for his sins. Not Trump, who seems largely indifferent to any suffering except his own and entirely immune to remorse, or its wistful cousin, regret.

Which is why his supporters like him. They were tired of having concerns about immigration dismissed as racist, beyond the pale — and they tired, too, of having their opinions about crime, terrorism or trade met with the same unanswerable accusation. Trump ignored the whole pious apparatus of unspoken rules that axiomatically excluded their arguments from the public square. The fact that he was shameless, brazen and unconcerned by procedural nicety, in his campaign and in his presidency, was one of his main attractions.

These traits have delivered enough victories — the 2016 election, the confirmation of Brett M. Kavanaugh to the Supreme Court — that his supporters are loath to question them now. Possibly his supporters are right; maybe Trump’s devil-may-care indifference is pure genius and will bring still more victories for those who followed him down the road less traveled.

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Yet it seems at least worth asking why so few politicians chart the course of nakedly shameless self-regard. Was Trump simply the first explorer daring enough to discover a novel route to power? Or is this an extremely risky passage, safe to travel only under unusual circumstances, and otherwise a dead end?

I’d argue the latter, though of course I — effete #NeverTrumper — can be expected to say nothing else. But even his most ardent supporters ought to recognize that superpowers can make one a villain as often as a hero, and that this particular superpower is at the very least risky for them.

Because if the waters turn stormy and the public rebels — if polls suggest we’re looking at a Democratic president and a filibuster-proof Democratic majority in the Senate — then the day will come when even many of Trump’s supporters want him to stage a strategic withdrawal. And on that day, they’ll discover that he pays exactly as little heed to his followers as he does to anyone else who is not named “Trump.”