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Indian social media is a brutal place, a window on the everyday hatred and violence that has come to colonize the country in the nine years since Prime Minister Narendra Modi’s government came to power. But the images from the northeastern state of Manipur that began circulating in July were shocking even by those low standards.

A video clip showed two women being sexually assaulted as they were paraded, naked, by a crowd of men who later gang-raped one of them, according to a police complaint. The horrific scene was part of an explosion of ethnic violence since May that has turned the small state into a war zone, killing more than 150 people and displacing tens of thousands.

The state has a long history of ethnic animosities that predate Mr. Modi’s rise. But the fuse for the current unrest in Manipur was lit by the politics of Hindu supremacy, xenophobia and religious polarization championed by his Bharatiya Janata Party.

India is a diverse nation, crisscrossed by religious, ethnic, caste, regional and political fault lines. Since Mr. Modi took office in 2014, his ruling party has torn those asunder with dangerous exclusionary politics intended to charge up the party’s base and advance its goal of remaking India’s secular republic into a majoritarian Hindu state. The repugnant nature of this brand of politics has been clear for some time, but the situation in Manipur shows what’s ahead for India: The world’s most populous country is slowly degenerating into a conflict zone of sectarian violence.

Christian activists take part in a candlelight vigil in protest over sexual violence against women and the ongoing ethnic violence in India’s northeastern state of Manipur, during a demonstration in Amritsar, India.Credit...Narinder Nanu/Agence France-Presse — Getty Images

Under Mr. Modi’s government, the state monopoly on violence is being surrendered to extremists and vigilantes. Those targeted by the kind of mob violence that we are seeing in India may conclude that equal rights are no longer guaranteed, that political differences can no longer be peacefully reconciled or fairly mediated and that violence is the only way for them to resist.

The targeting of minorities — particularly Muslims — by right-wing Hindu extremists is now a way of life in many states. Vigilante mobs, which often assemble provocatively in front of mosques, regularly assault Muslims as understaffed and underequipped police forces fail to intervene. Lynchings and open calls for genocide are common. India now ranks among the 10 countries at the highest risk of mass killings, according to Early Warning Project, which assesses such risks around the world.

In Manipur, Christians are bearing the brunt as the state’s B.J.P. government stokes the insecurities of the majority ethnic Meitei, who are predominantly Hindu. State leaders have branded the Kuki who populate the hill districts and who are mostly Christian as infiltrators from Myanmar, blamed them for poppy cultivation intended for the drug trade and evicted some of them from their forest habitats. The specific trigger for the current violence was a court ruling in the state in favor of granting the Meitei affirmative action provisions and other benefits that have long been enjoyed by the Kuki and other tribes, which sparked a protest by tribal communities opposed to the ruling. The Manipur government this year also began a citizenship verification drive that infringes on the privacy of Kuki. A similar drive in neighboring Assam state targeting Muslims has already reportedly disenfranchised nearly two million people.

Emboldened by the state government’s rhetoric, Meitei militias in Manipur have gone on a rampage of raping, pillaging, looting police armories and burning villages. More than 250 churches have been burned down. Those were Meitei men in the horrific 26-second video, sexually assaulting two Kuki women. (The video was shot in early May but came to light only in July, possibly delayed by a government internet ban imposed in the state in response to the violence.) Many similar attacks on Kuki women have been reported. Mr. Modi has called the rape incident “shameful” but has otherwise said little about the chaos in Manipur

The violent impact of his party’s polarizing politics is acutely felt in India’s heartland, too. The area near a tech and finance hub on the outskirts of New Delhi was rocked by violence last week as Hindu supremacists staging a religious procession clashed with Muslims. Mosques were attacked, an imam was killed, businesses were burned and looted, and hundreds of Muslims have fled.

In tandem with the B.J.P.’s demonizing of India’s nearly 200 million Muslims, television, cinema and social media are deployed to radicalize the Hindu majority, pumping out a steady stream of Islamophobia and vile dog whistles. Extremist groups, at least one of which appears to have received the public support of the prime minister, run amok. Muslims have been arrested for praying, had their livelihoods and businesses destroyed and their homes razed. Bulldozers, used to demolish homes, have become an anti-Muslim symbol, proudly paraded by B.J.P. supporters at political rallies.

As John Keane and I argue in our book “To Kill a Democracy: India’s Passage to Despotism,” it’s a signature tactic of modern-day despots: tightening their grip on power by redefining who belongs to the polity and ostracizing others. In the ultimate subversion of democracy, the government chooses the people, rather than the people choosing the government.

India is already a complex federation of regional identities, many of which consider themselves distinct from Hindi-speaking north India, the power base of Mr. Modi’s party. This federal structure is held together by delicate bonds of social and political accommodation. But they are fraying fast under Mr. Modi, who has no appetite for either, shrinking the space for nonviolent political contestation. Some regional political parties see the Bharatiya Janata Party’s centralizing and homogenizing Hindu-first thrust as a cultural imposition from outside and are assailing it with the same divisive us-versus-them vocabulary.

Debasish Roy Chowdhury (@Planet_Deb) is a Hong Kong-based Indian journalist and the author, with John Keane, of “To Kill a Democracy: India’s Passage to Despotism.”