They only started feeling something was terribly wrong when they learned the officials behind the Muggle-born Registration Commission (like Dolores Umbridge) were not fired. Worse, the muggle-borns illegally incarcerated during the war and sent to Azkaban for "stealing magic’ were not released either. The Commission was dissolved, but that was about all that was done about it. Innocents still laid in Azkaban while their oppressors continued to go free.