The agony of Donald Trump — well, one of the many agonies — is that there are times when he will actually do the right thing, or at least a defensible thing, and we’ll be left wondering, even more than we did with other presidents, about what his motivations were, whether they fit into any truly considered plan or whether his actions amount to the newest episode of a continuing reality show.

Such is the case with the strike against Syria, which is too big a risk in too complicated a place to be used for distraction, for diversion, for the pose he needs in the narrative du jour.

There’s justification for it, absolutely. President Obama had advisers who wished he’d done something similar, and there were Democrats aplenty — Hillary Clinton apparently among them — who found his restraint when it came to Syria and the regime of Bashar al-Assad to be infuriating, a surrender of America’s role and moral authority in the world.

But Trump’s military action makes little sense in the context of most of what he said in the years before he was elected and much of what he has done as president so far. Let me get this straight: Obama wasn’t supposed to draw or be drawn across a red line, not even when the Assad regime used chemical weapons, but when the regime did that on Trump’s watch, it crossed “many, many lines,” in his words, and compelled an American response?