A Marine combat vet shot and killed 12 patrons at a California bar.

Terrified patrons hurled barstools through windows to escape or threw their bodies protectively on top of friends as a Marine combat veteran killed 12 people at a country music bar in an attack that added Thousand Oaks to the tragic roster of American cities traumatized by mass shootings.

Dressed all in black with his hood pulled up, the gunman apparently took his own life as scores of police converged on the Borderline Bar & Grill in Southern California.

The motive for the rampage late Wednesday night was under investigation.

The killer , Ian David Long, 28, was a former machine gunner and Afghanistan war veteran who was interviewed by police at his home last spring after an episode of agitated behavior that authorities were told might be post-traumatic stress disorder.

Kind number one: Constitutional gun control not applied. The Founders were rightly wary of a standing army. They were also adamantly against the idea of foreign adventures. When you have those things, then you have perpetual military conflict in far-flung places like Afghanistan. You get amped up young Marines with PTSD. When said men come home from war, they tend to bring bits of war home with them. If the Founders’s controls were allowed to work again, we’d see less of this.

Kind number two: predictable failure of positive gun control. The shooter used an extended magazine in his Glock 21, in violation of California law. If this sort of ban ever worked, then this shooting could not have happened.

Gavin Newsome, you dumbass, it’s not a gun culture; it’s a big government culture.

Lessons not learned.