So this is not about "The Justice Department", it's about a person in a position of power, who abused that power.
I don't defend her actions, but neither do I presume to know her intentions. I do not imagine her cackling with glee at this outcome. Vilifying her, as an individual doing her job, is not warranted. That leaves the organization which gave her that job and ordered her to do it.
It is by that reasoning that I do believe it is about the "Justice Department" and not a particular prosecuting attorney within the department.
And, "no less"? On the contrary, all prosecutors do substantially less. They don't actually apply the law most of the time, if they did, we'd probably all be in prison. See this book:
http://www.amazon.com/Three-Felonies-Day-Target-Innocent/dp/...
Understand that Aaron's story is a classic Greek Tragedy, I'm sure that at this very moment some playwright/screenwriter is putting together a treatment of the form:
Act I: The boundless potential of unlimited talent in youth
Act II: The conflict of passion and righteousness over the injustice of broken copyright law. Climaxing in the arrest.
Act III: The pain of our hero being buried under a system too inured to the reality of the situation to distract it from its mission, and Aaron's death.
It has Oscar/Pulitzer written all over it. And if it can move the nation to change, like the novel To Kill a Mockingbird did, then Aaron's death won't be in vain.
The Justice Department is in the role of bad guy/antagonist in this play. They were the unwilling heroes in the antitrust action against Microsoft, and the before that the enforcement of civil rights laws. So they are equally capable of being 'put' in either role.