[nocoment]

I was going to respond with Germany. Specifically, the East German state did not own up to it like the West despite it being great propaganda for the founding of a communist state.

A government does not gain from showing its society a proper mirror. It runs the risk of losing ground by having "insulted" the guilty older generation and national identity, and simultaneously plants the distrust for itself (it mostly is that older generation) to form a youth revolt (the RAF supposedly formed from this distrust in West Germany.)