Survival of the Most Integrated

How Cooperation, Not Competition, Creates Strength

I recently saw a post on social media about Lynn Margulis, a woman whose scientific work was rejected repeatedly because she dared to challenge Charles Darwin’s Theory of Evolution. I realized, a little embarrassingly, that I had never heard of her, even though her work has quietly reshaped modern biology.

When I finally read her research, two things became immediately clear to me. First, her work matters far beyond a microbiology lens. Second, it maps cleanly onto much larger systems. I am a big-picture thinker with degrees in sociology and economics, so I naturally extrapolated her ideas in two directions: inward, toward our internal lives and the way we integrate parts of ourselves, as explored in Internal Family Systems; and outward, toward the front-row seats we all have to the unraveling of late-stage capitalism.

Margulis proposed that some of the most important evolutionary leaps did not come from competition, but from cooperation. More specifically, from organisms merging and integrating rather than defeating one another. Her work on endosymbiosis suggested that complex life emerged when early cells absorbed bacteria and formed lasting partnerships instead of destroying them. At the time, this idea was treated as fringe. It did not fit the dominant narrative of evolution as a ruthless, competitive process. It sounded too soft, too cooperative and too threatening to the story we liked telling ourselves.

Survival of the Fittest? Not Exactly.

The evidence kept stacking up, and eventually, the scientific community had to accept what the data made clear. Mitochondria, the energy-producing structures inside our cells, were once independent bacteria. They have their own DNA,  replicate independently, and they look and behave like bacteria because they were bacteria. Complex life exists not because something won, but because something learned how to live inside something else.

Most of us were taught a simplified version of evolution:

Variation exists –> resources are scarce –> organisms compete –> the strongest survive.

This framing, often attributed to Charles Darwin, has been flattened into a cultural belief system that goes far beyond biology. We apply it to work, relationships, economics, even self-worth. Compete harder. Optimize more. Weed out weakness. Win at all costs.

Natural selection is real, but it explains refinement, not origin. It explains how traits spread once life is already complex. It does not explain how complexity itself emerged in the first place. Endosymbiosis fills that gap. The biggest leap in the history of life did not come from better competition, it came from integration.

I was reading this in bed before I’d even had my first cup of coffee, and I was floored. I had used Darwin’s theory of evolution and natural selection, both internally and externally, for decades as justification for toughening up, becoming hyper-independent, and cutting off the parts of myself I considered weak. That didn’t necessarily go so well over time, and as I gaze inwardly at myself as I work more inclusively and as I look outward at the fall of capitalism in the United States, I can’t help but see this concept echo far and wide. And I love that this insight comes from the work of a woman who was widely dismissed. Sexism, unfortunately, is timeless.

How This Shows Up Internally

In psychology, there is a model called Internal Family Systems. At its core, it says that the human mind is not a single, unified voice. It is made up of parts. Protective parts. Anxious parts. Avoidant parts. Controlling parts. Each developed for a reason, usually in response to threat or pain. Traditional approaches often try to eliminate or overpower the parts that cause problems. Control the anxiety. Suppress the anger. Override the avoidance. Be stronger. Sound familiar?

IFS takes a different approach. It says that healing does not happen through domination, it happens through integration. When parts are listened to, understood, and given appropriate roles, the system becomes more stable, not weaker. Trying to exile parts creates internal conflict while integrating them increases capacity.

This is endosymbiosis at the psychological level. The anxious part is not a flaw, it is a threat detector that never got reassigned once the danger passed. The controlling part is not evil, it is a chaos manager that learned its job early and never got a promotion. When you try to silence these parts, they fight harder. When you integrate them, they stop hijacking the system.

A healthy human is not a hierarchy where one part rules and the others are crushed. A healthy human is a coordinated system.

Now zoom out again.

Zooming Out: Late-Stage Capitalism

America has built an economic and social system that treats internal competition as a virtue. Not just competition between companies, but competition within individuals, families, communities, and institutions. Productivity is moralized. Rest is laziness. Vulnerability is penalized. If you fall behind, it is framed as personal failure rather than systemic strain.

This is not accidental. Capitalism, especially in its late-stage form, rewards extraction and speed. It incentivizes short-term gains over long-term stability. It treats cooperation as inefficiency unless it can be monetized. It encourages every part of the system to look out for itself.

Biologically, This Is What Cancer Looks Like

Cancer cells do not cooperate – they ignore signals from the larger organism. They prioritize their own growth, drain shared resources, and destabilize the system that sustains them. For a while, they look successful but eventually, they kill the host and themselves with it. When a society forces its parts to compete for survival, the result is not strength – it is fragmentation. Chronic stress. Loss of trust. Loneliness. Rage. Rising violence. Collapsing community. These are not moral failures, they are predictable outcomes of systems that reward domination over coordination.

What makes this particularly insidious is that domination is often framed as realism. Integration is framed as naïve. Cooperation is dismissed as weakness. Care is treated as a luxury. This framing is appealing to traumatized systems. Control feels safer than trust when you do not believe the system will hold you. But safety built on domination is brittle – it requires constant enforcement (look at the news). Constant threat, constant winners and losers. Integrated systems are slower, yes, but they are also resilient. They redistribute energy and protect vulnerable parts because those parts stabilize the whole. They value contribution over conquest.

So What’s the Lesson?

The lesson from biology is not that competition has no place – it does. Natural selection still shapes life. But competition cannot be the organizing principle of everything. When it is, systems turn inward and begin to eat themselves. At the cellular level, life advanced by merging. At the psychological level, health comes from integrating parts rather than silencing them. At the societal level, stability depends on coordination, mutual dependence, and shared responsibility.

We are living inside a story that says domination equals strength. Biology tells a different story and  psychology confirms it. Our current social unraveling makes the cost of ignoring it painfully clear. The question is not whether competition works (it does in certain contexts). The question is whether we want it to be the foundation of our inner lives, our economies, and our communities. The evidence suggests that the systems that last are not the ones that win the hardest, but the ones that learn how to live together.