Donald Trump, the self-described “stable genius,” has given us yet another demonstration of why he is so damn dangerous as commander in chief of history’s greatest military machine.

With all the combat-experienced officers surrounding him, he either (a) ignored their advice or (b) never consulted with them prior to announcing a decision to pull all 2,000 or so troops out of Syria.

Trump declared that the Islamic State in Syria “has been defeated.” Really? Has it? Do we believe this president’s simple declaration? Do we take anything he says about such matters as a statement of irrefutable fact? I certainly do not!

The Pentagon got a major surprise Wednesday when the president tweeted a decision to pull the troops out. So did the State Department. Same with the CIA and the director of national intelligence.

No one saw it coming, according to reports.

One theory being kicked around is that Turkey’s president talked the president into pulling out of Syria. What do you suppose might have prompted that request? It might be that the Turks wanted our forces out of the way so they can deal more aggressively with Kurdish forces along the Turkey-Syria border; the Turks, you see, hate the Kurds and want to eliminate the threat posed by the Kurds — who have been fighting against the Syrian government — to the Turkish government.

Let’s not forget another party that is happy with this decision: That would be Russian strongman Vladimir Putin. Enough said about that one, yes?

To be clear, Trump acted within his presidential authority. He is the commander in chief. He possesses broad executive authority to do what he did.

It’s the so-called “wisdom” of the decision that has riled so many observers in Congress, most notably many of the president’s supposed “allies” within the Republican caucus in both congressional chambers. Congressional Democrats, of course, are shaking their heads in astonishment.

They, too, were surprised. The president didn’t consult with them, either.

Many of the president’s more ardent critics point out another curious dichotomy. It is that a New York attorney general has ordered the shuttering of the Trump Foundation because of what is alleged to be misuse of charitable donations, but still . . . the creator of that foundation maintains control of the nation’s nuclear launch codes.

Is this how you make America great again?

I think not.