There was a prophecy that the Servant of God will descent and lion, snake and children will be able to seek food at the same place peacefully.
The strive for perfection in druidic faith was based on emulation on how to achieve such a result, and it was thought that if every activities of every creature on earth can be simulated in harmony, so that every creature has their shares and every creature share their living space in an ecosystem of harmony it can be achieved.
Druids strive to create an ecosystem for all being to live together and make a living together, fulfilling everyone without disturbing the others. This is the core of druid's effort: the Ecosystem of Harmony.
Druids believes that past effort to create utopia failed because those who sought it only tried to gather what they think was needed for utopia without trying to create a system to make it work, believing what they've done was enough than leave it to chance.
Druid's effort on the Ecosytem of Harmony was to note all creature's needs and all creature's lifestyle and whatever resulted from their activities, then to fulfill each creature's needs and to make sure whatever activities and its result can be accounted on the ecosystem, so that everything works in a closed system (ecosystem).
Druids gains the knowledge from the 21st century experiment on making a closed ecosystem in outer space in a space station that mimic Earth's ecosystem, Project (currently not named), and adapting the result to alter the nuclear wasteland into habitable dominions (Fallout's Garden of Eden Creation Kit).
As they changed the wasteland into habitable ecosystems, they become the owner of said dominions and their descendant inherit it, making way for the post Fallout's feudalism.