The Hidden Cost of Conviction

Why Your Certainty Might Be a Trap

In 2003, Daniel Andreas San Diego planted pipe bombs at two California biotech companies. He wasn’t a career criminal or a mercenary for hire; he was an animal rights activist. He believed that the exploitation of animals for research violated an absolute sacred value: the inviolable sanctity of animal life.

San Diego’s actions weren’t calculated through a pragmatic lens of outcomes. He didn’t ask if the bombs would actually save animals or if they would simply traumatize humans and set his cause back decades. He was driven by a moral imperative that demanded direct confrontation, regardless of the fallout. He spent years evading capture, and in 2009, he became the first domestic terrorist added to the FBI’s Most Wanted list.

San Diego’s story is a chilling example of what happens when “sacred values” hijack human reasoning. It reveals a fatal flaw in our cognition: when we believe we are fighting for absolute truth, we cease to consider the consequences. We turn principled stands into oversimplified, dangerous acts that ignore the complexity of a world with eight billion people.

The Mystery of the Knowledge Illusion

To understand why someone like San Diego, or any of us, can fall into the trap of radical conviction, we must examine a foundational concept from cognitive scientist Steven Sloman: The Knowledge Illusion.

Most of us live under the “Illusion of Explanatory Depth.” We think we understand how the world works. We have strong opinions on climate policy, biomedical ethics, and economic systems. But if you were asked to explain, in detail, the step-by-step mechanics of how a zipper works—or how a specific piece of legislation would ripple through the supply chain—you would likely falter.

This is the “Knowledge Illusion.” We don’t actually store all this information in our heads; we “outsource” it to our community. We are designed to think in tribes. But in 2026, our tribes have shifted from groups of 150 people we know by name to global digital echo chambers.

When we lack a deep understanding, we resort to “community-sourced slogans.” These slogans affirm our sacred values and give us a sense of belonging (“I am one of the good people”), but they erect walls. Debates revolve into “right vs. wrong” binaries, and we stop asking the most important question of all: What are the actual consequences?

The Hive Mind: Our Community of Knowledge

This isn't a defect; it's a feature. Humans are the most successful species on earth because we don't try to know everything ourselves. We distribute the labor of thinking. You don't need to know how to build a smartphone to use one; you rely on the "community of knowledge."

But in 2026, this system is glitching. When we move from technical knowledge (how to build a phone) to moral knowledge (how to run a society), we stop relying on experts and start relying on community-sourced slogans. These slogans affirm our sacred values and give us a sense of belonging, but they erect walls. Debates devolve into "right vs. wrong" binaries, sidelining the nuanced questions of impact, progress, and societal safety.

The Polarizer’s Glow: A Societal Survival Trap

There is a biological “reward” for conviction. When you stand up for a sacred value, your brain experiences what researchers call the “Polarizer’s Glow.” It is a visceral, unifying feeling of moral certainty.

In our tribal past, this glow was a survival mechanism. It kept the tribe unified against threats. But today, this “glow” is a trap. It acts as a cognitive shortcut that simplifies complexity and inflames passions. When we are in the “glow,” we aren’t seeing people; we are seeing categories. We aren’t building a “Shelter” for others; we are building a “Monument” to our own ego.

Steven Sloman’s research shows a fascinating paradox: the more we rely on these sacred values to define our groups, the more we amplify polarization. When we pivot to “Consequentialism”—that is, by examining the evidence-based outcomes of our stances—our hostility diminishes, and our thinking clarifies.

The Blueprint for Wiser Thinking

In a world riven by echo chambers and outrage, we must reclaim the effort of outcome-focused thinking. Steven Sloman’s work provides a framework for moving from “The Illusion of Knowledge” to “Reasoned Humility.”

1. Question Your Certainty. The next time you feel a surge of moral outrage, ask: “Why am I believing this?” If the answer is “It just feels right” or “My group says so,” recognize that you are likely leaning on a sacred value shortcut. Dig for the tangible consequences. Who is helped? Who is harmed?

2. Acknowledge the Value, Then Explore Outcomes. In conflicts, we tend to attack the other person’s core values, which only makes them retreat deeper into their certainty. Instead, affirm the value first (“I respect your commitment to animal welfare”) before probing the implications (“Let’s look at the trade-offs regarding human health advancements”). This lowers the nervous system’s defenses and invites real discussion.

3. Embrace Adversarial Cooperation. We thrive when our ideas are challenged. This is the “Community of Knowledge” at its best. If you only surround yourself with people who confirm your convictions, you aren’t thinking; you’re just echoing. Seek out “adversarial cooperation”—constructive disagreement that refines ideas and tempers extremes.

4. Respect Expertise and Humility. Wisdom begins with the acknowledgment that one's knowledge is partial. We are only as smart as the systems we inhabit. Lean on experts who grasp complexities, while owning that your own explanations are limited.

Conviction as Action’s Double-Edge Sword

Conviction is a powerful tool for moral progress, but without the balance of inquiry and consequence, it risks becoming a weapon. As divisions intensify in 2026, Steven Sloman’s call is a timely one: we must reclaim the effort of thinking for ourselves while acknowledging we can’t know it all.

Thoughtful decision-making is a practice. It tempers conviction with inquiry. In a slogan-driven age, remember: your mind shapes your actions. Whether you are debating animal rights or navigating daily choices, the spark of reasoned humility is what keeps us human.

A Closing Reflection

If 2026 calls for mending rifts, the work begins within.

Select one issue this week where your conviction feels “sacred” and absolute. Ask yourself: What are the real-world effects of this stance? Who am I expecting to maintain this certainty?

What conviction will you question this week? Hit reply and let me know. Your reflection might just awaken mine.

Listen to the full exploration in Passion Struck Episode 715 with Dr. Steven Sloman.

Download the Free Digital Companion Workbook with Prompts for Better Decision Making

Purchase The Cost of Conviction.

(For more, check Steven’s site: https://copsy.brown.edu/people/steven-sloman)