Clumpy Cooperation

In a recent Scientific American article about the evolution of cooperation, Martin Nowak, Director for the Program for Evolutionary Dynamics at Harvard, described five different evolutionary patterns that led to cooperative behavior in biological systems.  The one that stood out to me was a pattern that could be called "clumping."  This is how he described the pattern:

"in well-mixed populations, the defectors prevailed.  In populations with clumps of cooperators and defectors, in contrast, cooperators won out."

Now, to be fair, he was talking about populations of yeast colonies.  But, wouldn't you agree that "clumping" with like-minded people supports your good intentions?  Isn't this what support groups, AA, and teams have always known?  

Somehow, when we clump together, the energy we create, and the potential that we can manifest, is more than the sum of what we could each accomplish alone.  I love that.