The United States spent twenty years trying to keep the Taliban out of Kabul. During much of that time, it treated the religious networks that helped shape the Taliban’s worldview as a matter for immigration officials, charity regulators and local school authorities. Each institution saw a small part of the picture. Nobody was responsible for seeing the whole.

That division made sense if the threat was understood as a group of armed men in Afghanistan. It made considerably less sense once religious movements from Pakistan began building American institutions of their own. A cleric received a visa. A school opened. A charity collected donations. A seminary sought recognition. None of those acts, taken alone, established wrongdoing. Together, they showed that ideas and loyalties formed in South Asia no longer needed to be imported afresh with each generation. They could acquire an American address, a tax status and eventually an American-trained clergy.

Darul Qasim illustrates the change. Founded in the Chicago area in 1999 and rooted in the Deobandi tradition, it received authorisation from Illinois to operate as a college in 2022. From autumn 2026, it will be able to award a master’s degree in Islamic law and theology. There is nothing inherently suspect about a religious college receiving state authorisation. The point is that an intellectual tradition closely associated with the world from which the Taliban emerged now has the institutional capacity to reproduce itself in the United States. It is part of American religious life, and should be understood as such.

American policy has had trouble finding a language for this. Deobandism is a broad tradition, not a synonym for the Taliban, and an American Deobandi institution cannot be judged by the actions of militants in Afghanistan. Yet the opposite conclusion is equally careless: that because an institution is lawful, its political ideas, foreign relationships and influence are of no public interest. Between collective suspicion and deliberate incuriosity lies the ordinary work of understanding who is shaping a community and what they are teaching.

The question becomes sharper when American money travels back to the country Washington spent two decades at war with. Islamic Oasis, based in Chicago, has worked with the British-German Qamar Charity Foundation on projects in Taliban-ruled Afghanistan, including mosques and activities involving universities and officials of the Emirate. Building a mosque is not an armed attack. But under the Taliban, religious and educational projects also have political consequences. An organisation able to raise funds in America and work with the authorities in Afghanistan occupies a position the United States ought at least to be capable of examining.

Pakistan sits behind much of this story. For decades, its security establishment divided Islamist movements according to their usefulness to the state. The Afghan Taliban were cultivated as an instrument of influence in Kabul; Lashkar-e-Taiba served the confrontation with India. Groups that threatened the Pakistani army were treated differently from those whose violence could be directed elsewhere. Washington objected to this arrangement repeatedly, while continuing to depend on Pakistan for the war in Afghanistan.

At home, America developed its own habit of drawing the line at violence. The organisation carrying out an attack received the attention of investigators. The lawful association raising money, training preachers or promoting the political cause from which an armed movement drew support was treated as somebody else’s problem. That distinction is necessary in law: shared beliefs cannot substitute for evidence of a crime. It is inadequate as an explanation of how a movement grows.

The consequences are visible beyond Afghanistan. In 2017, clerics from the United States, Pakistan and Canada gathered in Alexandria, Virginia, for a conference against Ahmadis. In Pakistan, Ahmadis have been legally excluded from Islam and subjected to sustained persecution. The conference showed how a campaign born in the subcontinent could be carried into an American setting through ordinary religious organisation. No armed cell was required. The participants could use the freedoms available in Virginia to promote an exclusion that Pakistani law had already made brutally concrete.

Other South Asian movements have also built presences through mosques, schools and charities. They do not share one doctrine or one relationship with violence. Their American activities cannot be understood by placing them all in the same security category. They can, however, be understood as part of a larger political and religious landscape connected to Pakistan, Bangladesh, India and Afghanistan. Treating each institution as an isolated local charity obscures those connections.

The financial system reinforces the problem. A nonprofit may be entirely lawful and still warrant scrutiny over its partners and the destinations of its funds. Helping Hand for Relief and Development, associated with the Jamaat-e-Islami milieu, took part in a 2017 initiative in Pakistan alongside an organisation linked to Lashkar-e-Taiba and later received federal funding. The issue is not that an association proves support for terrorism. It is that such associations should produce serious questions before public money is awarded, rather than surprise after the fact.

America’s political argument makes those questions harder to ask. Some on the right speak as though Muslim belief itself were a security concern. Some on the left respond as though Islamist movements were simply religious communities under another name. Neither position gives ordinary Muslims much credit. It overlooks the many people who have come to America precisely to escape the sectarian coercion, political intimidation or blasphemy politics familiar from their countries of origin.

The United States does not need a new war on religion. It needs to apply the standards it already claims to uphold: examine financial relationships, enforce disclosure rules, investigate credible evidence of unlawful activity and distinguish a community from the organisations competing to represent it. Above all, it needs to take political ideas seriously even when they are expressed by people who have broken no law.

In Afghanistan, Washington understood far too late that killing fighters could not compensate for its failure to understand the institutions and alliances around them. The American institutions connected to South Asian Islamism present a different problem, requiring different tools. The common error would be to wait for violence before deciding that the world in which it develops is worth knowing.