Is there any wonder that Assad felt no compunction about perpetrating what this paper described as “one of the deadliest chemical weapons attacks in years in Syria,” killing dozens of people in Idlib Province, the last major holdout for Syrian rebels.

Mind you, Donald Trump did not cause this Syria problem, and he is right to complain that it was left in his lap by the Obama team, which had its own futile strategy for dealing with Syria — trying to negotiate with Russia and Iran, the key players there, without creating any leverage on the ground.

But if you’re looking for a culprit for why America has refused to intervene in Syria, you have to look both to your left and to your right.

“The only obstacle to putting real U.S. military leverage into Syria is democracy in America,” explained the foreign policy expert Michael Mandelbaum, author of “Mission Failure: America and the World in the Post-Cold War Era.” “The American public simply does not want to spend the blood and treasure to produce what would probably be a less awful but still not good outcome in Syria.” And that is a byproduct of the failed George W. Bush interventions in Iraq and Afghanistan.

Alas, though, I now think doing nothing is a mistake. Just letting Assad keep trying to restore control over all of Syria will mean endless massacres. A negotiated power-sharing solution is impossible; there is no trust.

The least bad solution is a partition of Syria and the creation of a primarily Sunni protected area — protected by an international force, including, if necessary, some U.S. troops. That should at least stop the killing — and the refugee flows that are fueling a populist-nationalist backlash all across the European Union.

It won’t be pretty or easy. But in the Cold War we put 400,000 troops in Europe to keep the sectarian peace there and to keep Europe on a democracy track. Having NATO and the Arab League establish a safe zone in Syria for the same purpose is worth a try. And then if Putin and Iran want to keep the butcher Assad in Damascus, they can have him.

It’s either that, President Trump, or get ready for a lot more days like Tuesday. As I said, every problem is like Obamacare — never as easy as you thought to fix. The least bad alternatives can be forged only by a compromise in the middle, and, like your hotels, they’ll all soon have your name on them.