But two heads are indeed often better than one. Maybe not double, but perhaps more than one. That is how tail striping may have evolved. There are some cultural counterparts of automimicry that might make the concept more intelligible. Shaving is a form of automimicry, where we duplicate the signal from another age group - a more juvenile age class.
Automobiles are an important status symbol, hence threat tools.
As many have pointed out, autos are giant creatures, extensions of the driver headlights as eyes and the grill a gaping jaw of shiny teeth. The coming of the dual headlight was hailed as an automobile salesman's windfall - it almost doubled the threat value. Many officers have taken to putting two red flasher lights on top, and several I have seen had two sirens. These are all forms of automimicry. One of the categories of automimicry I mentioned was the mimicry of one age class by another.