The Rectangles
The Rectangles were a society of 4-sided polygons with their 4 sides placed at equal, 90-degree, angles. While they came in different widths, and they even grew into adulthood, their heights were approximately 60% greater than their widths, with variation due to random mutation.
One day, one of the polygons wanted to try to acquire power over the others, so he declared that each polygon should be exactly equal. At first, the others thought this was silly, because polygons had been getting along fine with--and were even benefitting from--the random variance in shapes.
For instance, in cases where the sewer system broke down, skinny polygons could fit better into the pipes so that they could go in and work on them without getting stuck. Wide polygons were better at holding up heavy things, due to having a wider base of support than skinny ones.
Nevertheless, polygons started to believe the moral propaganda that there should exist "a complete equality of shape" in society.
The natural inequalities among polygons--allowing for some disparity in outcomes regarding whether certain polygons could be employed in certain industries--came to be thought of as an "evil" which should be fought, even if it requires all of the resources of society to be funneled through to the leader: so that he can "fix it."
Polygons then gave up their personal aspirations in exchange for this unverified, abstract ideal.
That one polygon who initially promoted equality at the expense of everything else then rose to power and ruled over the others. Young polygons were measured in school and sent to "de-extension factories" if it was determined that they were getting "too tall."
The screams from the factories--as those polygons deemed "too tall" by the leader were having their edges shaved back by a grinder--would frighten the young polygons and make them have nightmares that, one day, they will also be led into the factory to have their edges shaved down.
The leader had unchecked power over the others, based on an unverified moral notion that equality is always best, if not the only truly important thing in life. By adopting a morality of equality, the polygons had relegated themselves to a nightmare existence of subjugation and strife.
Child polygons who hadn't yet had their spirit crushed dreamed of a better world where equality was knocked back down from being a top importance--a society where freedom was deemed to be more important than equality (so that freedom was never sacrificed for equality, whenever more of one required somewhat less of the other).
The children knew that this was a morality which could be verified (proven correct).
The End
Image Attribution
Page URL: https://commons.wikimedia.org/wiki/File:Illustration_of_distributive_property_with_rectangles.svg
Attribution: Stephan Kulla (User:Stephan Kulla) [CC0]