If you cannot arrest the people in the "low level indictments" or threaten them with prison then they aren't going to help you with the "bigger fish".
Mueller has already brought these charges in front of a judge
You're entirely wrong. This went in front of a grand jury, not a judge. That shows that your understanding of this whole process may not be what it needs to be to make the arguments you are making. Anger in no way makes up for lack of knowledge.