Following the war, the Dementors had been banished back to their original enumerated purpose as jailers for the Azkaban inmates and their powers significantly reined in. Harry wasn't certain if the penitentiary culture would be different after the war as opposed to before, back in his godfather's time here as an inmate, or if anyone would find criminal justice reform as it applied to Azkaban even necessary. Someone who believed in the law as fervently as Hermione did would probably advocate for more humane treatment, so as to avoid sowing resentment that could potentially create an opening similar to the one after World War I and the Treaty of Versailles, or here in the magical realm following the Second World War and the concurrent fall of Grindelwald.