Islamist extremists cold-bloodedly kill at least 28 people, many of them children — and it doesn’t bring nonstop cable news coverage, because the world has already “normalized” terrorism in the Middle East.

Gunmen believed to be ISIS members on Friday boarded three buses carrying Christian pilgrims in central Egypt and began shooting people at point-blank range.

The victims were just as innocent as those slain by the suicide bomber outside that Ariana Grande concert. But much of the world has relegated the targeting of Coptic Christians to ho-hum news.

Make no mistake, though: These victims were targeted precisely because of their religion. Copts make up 10 percent of Egypt’s population; they are the world’s oldest Christian community and the largest one in the Middle East.

And in the past few years they’ve suffered a wave of bloodshed by “soldiers” of the self-proclaimed Caliphate that includes bombings and mass beheadings.

Just last month, ISIS’s Egyptian affiliate, Sinai Peninsula, bombed Coptic churches in Alexandria and Tanta, killing at least 78 worshippers.

Friday’s victims were headed in a convoy to the Monastery of St. Samuel in Minya, some 190 miles south of Cairo, when they were waylaid by the waiting gunmen.

So why has this story received so much less coverage than the Manchester horror? Because terror attacks in the West are still rare enough to shock — at least for now.

Yet every terror attack in Europe is followed by calls to (more or less) get used to it. Even here in America, some write off the terror threat because you’re more likely to die in some mundane household accident.

Yet the answer isn’t to stop being shocked and outraged: It’s to transform that fury into cold action to end the threat.

And we should be just as outraged when it happens “over there” — especially when Christians are under siege daily for practicing their faith.