I know Narcissa lied to Tom that Harry was dead but if that's enough, it should only be enough for her. And then for Draco, he was a child and backed out and didn't do anything that significant to get him to go to Azkaban, I guess. But what about Lucius?

He escaped from Azkaban and did a lot of significant stuff fighting on Tom's side. In the first Wizarding war and the second. I think he should've.

Also if Hermione is Minister of Magic, shouldn't she probably realize that and have a hearing about it? But idk I'm not completely sure.