So, it turns out Islam is a religion. Imagine that.

Granted, this would be considered self-evident by most of us, but it has been a matter of great controversy in the Tennessee town of Murfreesboro, where 17 people went to court last year to prevent a group of Muslims from building a mosque. On their own land.

The need to defend this fundamental right was only one of the ordeals visited upon the Muslims of Murfreesboro, who have also faced threats, vandalism and arson. As recently, vividly illustrated in “Unwelcome: The Muslims Next Door,” a troubling CNN documentary, the antagonists here are a clownish band of bigots scared witless by the prospect that a new mosque will be built in their community by a congregation that has already worshipped in said community for 30 years.

Seriously. You can’t make this stuff up.

The 17 had contended Muslims have no constitutional freedom to worship because Islam is not a religion. So the statement at the top of this column represents not just self-evident truth, but an actual ruling last week by an actual judge in an actual court. Again: seriously. Chancellor Robert Corlew, the aforementioned actual judge, was obliged to verify that Islam — which has survived 14 centuries, and claims a billion and a half adherents — is a religion.

As reported in the Daily News Journal of Murfreesboro, in throwing out most of the plaintiff’s case, Corlew also dismissed claims that “Kevin Fisher, an African-American Christian, would be subject to being a second-class citizen under Sharia law; Lisa Moore would be targeted for death under Sharia law because she’s a Jewish female; Henry Golzynski has been harmed because he lost a son fighting in Fallujah, Iraq, by insurgents pursuing jihad as dictated by Sharia law.”

Maybe you’re tempted to turn away in disgust. Yield not to temptation. We need to see this. This is what it looks like when a country loses its mind.

It looked like this in Germany in 1938 on Kristallnacht, in Rwanda in 1994 when the Hutus savaged the Tutsis, in America in 1942 when the Japanese were herded behind barbed wire.

My point is explicitly not that Muslims face mass vandalism, genocide or internment. Lord only knows what they face. Rather, my point is that the psychological architecture of what happened then is identical to the psychological architecture of Murfreesboro now. Once again, we see people goaded by their own night terrors, hatreds, need for scapegoats, and by the repetitive booming of demagogues, until they go to a place beyond reason.

And in that place inevitably lies a dark night of malice, destruction and awful deeds that seem like good ideas at the time. When it passes, like a fever, we — the doers and those who simply observe — are left shivering in a cold dawn as reason reasserts itself, wondering how barbarism overtook us, what broke loose inside us, and vowing that it will never happen again. Never again.

Me, I don’t fear Muslims. I fear Muslim extremists. I fear extremists, period. And that group in Murfreesboro, make no mistake, are extremists.

Against their extremism, I find bitter succor in the inevitability of that cold dawn. Yes, there will come a morning after.

But first we must learn how dark this night will be.