Definition
The Texas Sharpshooter Fallacy occurs when someone chooses the criteria for success or failure after the outcome is already known. It involves drawing the “bull’s-eye” around the cluster of results to create an illusion of meaning or causation where none exists.
Why It Matters
This fallacy is the ultimate source of false patterns and conspiracy theories. It reminds us that ‘hitting the target’ is easy if you draw the bull’s-eye afterward, protecting us from over-fitting our models to random noise in a data-rich world.
Core Concepts
- Post Hoc Reasoning: Deciding that a piece of evidence is significant only because it matches a desired conclusion, rather than based on pre-determined principles.
- Pattern Hunting in Noise: Random data will often cluster by chance. The sharpshooter ignores the random distribution and focuses only on the cluster.
- Conspiracy Thinking Tool: Used to “prove” a conspiracy by pointing to anomalies that were only identified as significant after the event (e.g., the size of the hole in the Pentagon on 9/11).
- Subtle Backward Reasoning: Anytime we reason backward from known outcomes to find “proof,” we risk falling into this trap.