| Quote #1
"She deserved it," Harry said, breathing very fast. "She deserved what she got. You keep away from me." (2.3.30)
Harry issues a rather harsh judgment against Aunt Marge here, and it's notably a judgment borne out of anger. The detail about Harry's quick breathing reveals just how agitated he is.
| Quote #2
Hagrid wasn't a fully qualified wizard; he had been expelled from Hogwarts in his third year for a crime he had not committed. It had been Harry, Ron, and Hermione who had cleared Hagrid's name last year. (5.264)
The justice system in the wizarding world has definite flaws – it's an idea that got introduced in the second book, and we definitely learn more about it here.
| Quote #3
"Miss Dursley has been punctured and her memory has been modified. She has no recollection of the incident at all. So that's that, and no harm done."
Harry gets a crash course in politics here, as Fudge opts to not punish him for a variety of reasons, none of which have to do with actual rules or laws.