How are we supposed to make sense of this? (Kent Nishimura / Los Angeles Times via Getty Images)

After the horrific racist mass shooting of 13 people — 11 of them black — in a Buffalo, New York supermarket, it is vital to ask what caused such violence. For some progressives, the answer is already clear: Republicans, notably Donald Trump and Tucker Carlson, have blood on their hands because they endorse the “Great Replacement” theory that the shooter, Payton Gendron, referenced in his 180-page manifesto. This is the same phrase used by the El Paso shooter, who targeted Latinos, and by Brenton Tarrant, the Christchurch killer whose victims were Muslim.
The Great Replacement theory argues that an elite cabal, often Jewish, sometimes Leftist, seeks to “replace” Western whites with minority immigrants. Like any conspiracy theory, it has is a kernel of truth upon which the fantastic elements are grafted. Many mainstream and liberal writers have drawn attention to the ethnic transformation of the West. The term “replacement population” has a long history of use by demographers and geographers. In Western countries, whites are a smaller share of the population than they were in 1960, and I suspect this is why many French or Americans think replacement is real.
On the other hand, there is no evidence that Jews have had much influence over such changes, and while the Left has sometimes celebrated demographic change or sought to capitalise on it electorally, the claim that Leftists orchestrated this change is not credible. Immigration policy in the US has long been driven by short-termist rather than long-termist considerations. Indeed, the Democratic architects of the transformational Hart-Celler Immigration and Nationality Act of 1965 claimed it would not alter the ethnic composition of the United States. There is no evidence they believed otherwise.
Do Tucker and Trump bear responsibility for Buffalo? From a social scientific standpoint, this account is plausible, but so are several others. Vivid images and emotions often lead us to snap judgments that are highly prone to confirmation bias. In order to surmount such biases, the scientific method asks us to step back from emotive data points, entertain competing theories, and open our own explanations up to falsification.
Consider the following hypotheses on how media and political narratives might influence mass shootings like the one in Buffalo:
1. Tucker Carlson, Donald Trump and the Republicans are to blame.
Trump spoke of “fine people” among the Charlottesville rioters, and Carlson has said that “the Democratic Party is trying to replace the current electorate, the voters now casting ballots, with new people, more obedient voters from the Third World”. A number of others, including Representative Elise Stefanik of New York, have endorsed the theory that lax border enforcement is a deliberate Democratic policy to improve its electoral fortunes. These comments could have created the narrative mood music within which the shooter operated.
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