There is no way that any citizen of a modern democracy could have written the courtroom scene in Order of the Phoenix and thought well of the society that produced it. That's when I started to really see how rotten the country was. Similarly, look at the utter incompetence of the politicians - they're worse than ours, and that takes some doing. There's enough other examples scattered throughout that I cannot believe that they were placed there unconsciously.

Politics and litigation are almost totally incomprehensible to the average citizen. Therefore, it seems very plausible to me that Rowling thought she was depicting something analogous to what actually happens. Maybe not what happens frequently, but happens occasionally in a country the size of Magical Britain.

I think she's wrong to think her depictions were realistic, but that's a separate issue.