The Nature-Nurture-Nietzsche Newsletter

The Nature-Nurture-Nietzsche Newsletter

12 Things Everyone Should Know About Conspiracy Theories

The strange psychology of suspicious minds

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Steve Stewart-Williams
Nov 15, 2025
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This is the latest post in my “12 Things Everyone Should Know” series. You can access the full collection here.

From JFK and 9/11 to Big Pharma and stolen elections, conspiracy theories loom large in modern life. We like to imagine they’re the obsessions of a handful of fringe extremists - but unfortunately, that’s wishful thinking. Although any specific conspiracy theory is rare, a large fraction of people believe at least one. And conspiracy thinking is not unique to any country, culture, or time. It’s a fellow traveler of human beings everywhere and always.

The scientific study of conspiracy theories - and of the psychology behind them - is surprisingly new. It’s also surprisingly tricky. Just for starters, not everyone agrees on what counts as a conspiracy theory. Is the lab-leak hypothesis one? What about the patriarchy? It’s easy to see how the political preferences of researchers could shape their answers to questions like these.

Yet despite the challenges, psychologists have made real progress in mapping the conspiratorial mind. In this installment of the “12 Things Everyone Should Know” series, we’ll look at some of their most important discoveries. Among other things, we’ll ask: Why do some people tumble down rabbit holes while others just shrug and move on? Are conspiracy theories becoming more common, or does it just feel that way? And perhaps most importantly, are there any reliable ways to weaken the grip of a conspiracy mindset?


1. Narcissism Is a Strong Predictor of Conspiracy Thinking

Some personalities are more fertile soil for conspiracy theories than others. Research on the Big Five personality traits, for instance, shows that low agreeableness and high neuroticism tilt the odds toward conspiratorial thinking. Other personality predictors include entitlement, low inquisitiveness, low humility, and a victimhood mentality.

But the single strongest personality predictor is narcissism. Narcissists are particularly prone to conspiracy theories because they have a strong need for uniqueness, are prone to paranoia, and can also be remarkably gullible.

Estimated effect sizes and 95% confidence intervals for the correlations between individual-level and intergroup factors and conspiracy beliefs as reported by five meta-analyses. Marker size and line thickness represent the number of primary studies included in the meta-analysis: larger markers and thicker lines denote 30 primary studies; smaller markers and thinner lines denote 20 primary studies. CI, confidence interval. Source: Hornsey et al. (2023).

2. Conspiracy Theories Are Found on Both Sides of the Political Aisle

There’s a popular idea that conspiracy thinking is mainly a disease of the political right - but the data refuse to play ball. A massive study surveying nearly 40,000 people from 20 countries found that liberals and conservatives are equally prone to conspiracy theories, but just prefer different ones.

Fig. 1
Pearson correlations between beliefs in conspiracy theories and partisan and ideological self-identification. Horizontal bands represent 95% confidence intervals, two-tailed tests. Source: Enders et al. (2023).

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