A Daily Beast report last week on the horrors of a recent ISIS attack in Syria, and the Assad regime and Russia’s suspected role in it, offers fresh grounds for a continued US presence in the region.

The July 25 onslaught by 400 Islamic State fighters left 200-plus Druze dead, 200 more injured and several dozen others — women, teens, babies — kidnapped. A 19-year-old was later beheaded.

Druze leaders, the report notes, believe the massacre was punishment by Bashar al-Assad for their turning down a request by Russian military officials to join regime troops and their Russian- and Iranian-backed allies in a hit on militants in Idlib. (The Druze want to remain neutral.)

As evidence of Assad’s complicity, Druze spokesmen point to regime moves just before the ISIS attack: Electricity and phone service cut off; troops withdrawn from checkpoints, giving the attackers ready access to Druze villages. Afterward, Assad also refused to send ambulances to help victims.

A government official even escorted ISIS fighters to kill Druze in their homes, a captured militant admits in a video.

Syrian dictator Assad has long claimed the now 7-year-old war is an effort to stop jihadi terrorists. But evidence shows he has actually often allied with ISIS.

The Druze now face threats from regime and ISIS fighters (several thousand are still active in Syria) and their Russian and Iranian allies. They’re seeking an international force to protect them, along with Yazidis, Christians and Kurds, much as US troops safeguard Kurds elsewhere in the area.

The putrid stew of bad actors — Iran, Russia, ISIS, other jihadis, Turks and the murderous Syrian regime itself — argues against Washington abandoning the area any time soon, despite President Trump’s hopes to do so.

Cede ground to the thugs, and the attack on the Druze will look like a picnic compared to what comes next.