“Metric fundamentalists” is a good term: That three-color map reflects the desire to oversimplify the world, to map the world as we wish rather than the way it is.
The aesthetic appeal of a standardized and orderly system like metric is driven by a tendency to seek order and symmetry rather than practical considerations.
To the metric fundamentalist the messiness and chaos in the real world results in demands that the government impose order. What the fundamentalist miss is the hidden order that results in leaving system to optimize using market forces.