According to police and news reports about Omar Mateen, the perpetrator of the atrocity in Orlando:

·      He was a Muslim and the son of refugees from Afghanistan who was born in New York.

·      His father imagines himself president or a military leader of Afghanistan and hosts a television program on which he has supported the Taliban and called for killing homosexuals.

·      He was said to have made remarks sympathetic to terrorism that brought him to the attention of the FBI, which found nothing actionable.

·      In accordance with the teaching of the crazy cult that is trying to hijack Islam he frequently beat his first wife, who came to consider him psychotic and left him.

·      Also in accordance with the teaching of the crazy cult, he was enraged by homosexuality, and, completing his psychosis, had homosexual tendencies himself, having often visited the gay bar where he eventually perpetrated his murderous rampage.

In this context Mateen's mid-rampage call to police to proclaim his loyalty to the Middle Eastern terrorist group ISIS seems more like a vainglorious afterthought than part of a conspiracy.

Predictably enough, Democrats are using the atrocity to argue for their gun-control agenda, including prohibition of "assault weapons," apparently any rifle with a magazine, any rifle capable of firing more than one or two shots at a time without reloading -- a dubious proposition. As for the Democrats' more compelling propositions -- more background checks for gun buyers and such -- they probably would not have disqualified Mateen from purchasing the guns he used. For he was already licensed as a security guard, held a Florida gun permit, and repeatedly had cleared background checks undertaken by his employer, a federal government contractor.

Also predictably enough, Republicans are using the atrocity to argue for restrictions on immigration and foreign visitors, and at last Donald Trump has figured out that while immigration and visitation cannot be restricted by religion -- not constitutionally and not practically, since no one at a border crossing would admit his adherence to a prohibited religion -- immigration and visitation can be restricted by national origin.

After the atrocity Trump and his recent rival for the Republican presidential nomination, Texas Sen. Ted Cruz, asserted that the United States should not be welcoming people from countries that sponsor or are infected by terrorism or that oppress women, homosexuals, and disfavored religions. Such an exclusion would cover most of Africa and all the Middle East except Israel, the only democratic country there and the refuge of many homosexual Palestinians but nevertheless the bogeyman of the political left.

As Mateen demonstrates, and as has been demonstrated by other recent acts of terrorism,  such as the Boston Marathon bombing and the Fort Hood massacre, a background in an oppressive culture can span the generations and explode unexpectedly.

Thus the atrocity in Orlando can be attributed as much to this country's negligent immigration policy as to its negligent gun policy. For our negligent immigration policy celebrates "multiculturalism" even as the culture being imported is repugnant. Europe, which is being overwhelmed by migrants who have contempt for Western values, lacks the will to defend itself and has become Eurabia, thereby showing where negligent immigration policy will take the United States.

Defending the country requires getting a lot more selective with immigration, admitting only those people who can show a firm commitment to democratic and secular culture, not mere desire to get away from someplace else. The country needs no more Afghan refugees, nor more of the Syrian refugees Connecticut's governor lately has been celebrating, nor any more immigrants from the vast expanse of primitive barbarism that constitutes Religious Crazy Land.

Chris Powell is managing editor of the Journal Inquirer, in Manchester, Conn.