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We are learning that second-generation Muslims like Mateen seem susceptible to Islamist imams preaching terror against the West to advance the restoration of the caliphate.

Does this not suggest a pause, and a long hard look before we continue with a policy of warmly welcoming all refugees fleeing the half-dozen wars roiling the Islamic world?

After World War II, we vetted German and East European migrants to ensure they were not fleeing Nazis or Soviet saboteurs or spies.

No one seemed to regard that as outrageous.

Devout Muslims believe there is “no God but Allah, and Muhammad is his Prophet.” Logically then, Muslim nations reject a “First Amendment” in their own societies that would protect a right of Christians to convert Muslims, or any “freedom of speech” that permits the mockery of Muhammad.

The iconoclasts at Charlie Hebdo learned that the penalty for blasphemy against Islam or insulting the prophet can be severe.

“East is East and West is West, and never the twain shall meet, Till Earth and Sky stand presently at God’s great Judgment Seat.”

So wrote Kipling. Islam, not only in its extremist forms but in its pure form, is incompatible with modern Western democracy.

And the conflict appears irreconcilable.

The policy that should result from this reality is that while we fight side-by-side to annihilate our common enemies, ISIS and al-Qaida, the West should give up the idea of democratization and secularization of the Islamic world.

And those who believe Islam is the one true faith, to which all of mankind must eventually submit, should be told that they are welcome as visitors—but not as immigrants. For that would ensure endless conflict.

The more Islamic the West becomes, the less it remains the West.