In the 1980s, handgun expert Jeff Cooper invented something called the Color Code to describe what he called the "combat mind-set."...
Cooper talked about remaining in Code Yellow over time, but he didn't write about its psychological toll. It's significant. Our brains can't be on that alert level constantly. We need downtime. We need to relax. This is why we have friends around whom we can let our guard down and homes where we can close our doors to outsiders. We only want to visit Yellowland occasionally.
Since 9/11, the US has increasingly become Yellowland, a place where we assume danger is imminent. It's damaging to us individually and as a society.
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The same effects occur when we believe we're living in an unsafe situation even if we're not. The psychological term for this is hypervigilance. Hypervigilance in the face of imagined danger causesstress and anxiety. This, in turn, alters how your hippocampus functions, and causes an excess of cortisol in your body. Now cortisol is great in small and infrequent doses, and helps you run away from tigers. But it destroys your brain and body if you marinate in it for extended periods of time.
Not only does trying to live in Yellowland harm you physically, it changes how you interact with your environment and it impairs your judgment. You forget what's normal and start seeing the enemy everywhere. Terrorism actually relies on this kind of reaction to succeed.
