Like a number of recent mass shootings, the one in El Paso on Saturday came with a manifesto. While authorities are still working to verify that this document explicitly was indeed written by the attacker, the evidence seems clear: It was posted to 8Chan minutes before the attack, by someone with the same name.

By manifesto, I mean a document laying out political and ideological reasons for the violence and connecting it to other acts of violence. We’re familiar with those. We can recite them. And yet our society still lacks a fundamental understanding of the nature of this violence and what it means.

Too many people still think of these attacks as single events, rather than interconnected actions carried out by domestic terrorists. We spend too much ink dividing them into anti-immigrant, racist, anti-Muslim or anti-Semitic attacks. True, they are these things. But they are also connected with one another through a broader white power ideology.

Likewise, too many people think that such shootings are the goal of fringe activism. They aren’t. They are planned to incite a much larger slaughter by “awakening” other people to join the movement.

The El Paso manifesto, if it is verified, ties the attacker into the mainstream of the white power movement, which came together after the Vietnam War and united Klan, neo-Nazi, skinhead and other activists. That movement, comparable in size to the much better known John Birch Society, never faced a major prosecution or crackdown that hobbled its activity. As a result, it was able to sink deep roots into society, largely under the radar of most Americans.

This movement is often called white nationalist, but too many people misunderstand that moniker as simply overzealous patriotism, or as promoting whiteness within the nation. But the nation at the heart of white nationalism is not the United States. It is the Aryan nation, imagined as a transnational white polity with interests fundamentally opposed to the United States and, for many activists, bent on the overthrow of the federal government.

The white power movement imagines race war, incited by mass violence among other strategies. The core texts of this movement, like “The Turner Diaries” or “Camp of the Saints,” aren’t just quaint novels, but rather provide a road map to how such violence could succeed. To call them manuals is too simplistic: They provide the collective ideas and vision by which a fringe movement can attempt a violent confrontation that could lead to race war.

These ideas run from the earlier period directly into today’s manifestos. Dylann Roof’s document discussed his desire to provoke race war. The Christchurch manifesto used images and phrases from the earlier movement. In the El Paso manifesto, the anti-immigrant rhetoric is thoroughly ensconced in other white power ideas.

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It is not enough to dismiss mass shootings as horror beyond our comprehension. It is our duty to understand their meaning and confront the movement that relies upon them.