Why does every post-Soviet country need lustration?

Communism had strong policy against any dissident: reeducation. If it did not work, then extermination. The society felt it and people eagerly introduced self-censorship. Even without direct order, they always realised what the party wanted them to do - and they did it.

Source: https://www.facebook.com/photo.php?fbid=10156570804952410&set=a.10150373425752410&type=3&permPage=1

In 1990 multiple protests took place in then Ukrainian Soviet Socialist Republic. People wanted freedom. People wanted independence. At the same time, young commies were building their career to reach the nomenclature top.
In 1990 Voronin, a student of the Institute of History, Taras Shevchenko University, criticised student that went on a hunger strike against the communist government.
Later he became a co-author of Dmytro Tabachnyk, a notorious pro-Russian historian and 2010-2014 Minister of Education. In Yanukovych times he got his civil servant post.

The lustration should have prevented such people from reaching any post in the government.



Story is based on the post by Vakhtang Kipiani: https://www.facebook.com/photo.php?fbid=10156570804952410&set=a.10150373425752410&type=3&permPage=1