The utopist urge for cultural tabula rasa is a retardation, a attempt of the brain to shirk embracing and discovering complexity. One has to look at the "backwards" parts to start to understand what works in a society and with the actual human beeings lifing in a actual society, not the wingless Star Trek Angels in PJs.
Embrace complexity, embrace analysis, build something without defining the endstate first. Make small things that work, combine them into bigger things that work. Way less calling for cullings of the "sabotaging traitors" as they are usual with utopists on the march.
(The State of the Art)