"At this point, the DOJ should apologize, investigate internally and fire those who were involved in Aaron's case."

This is a bit naive. Certainly it would help the DOJ's image if they did this, and certainly firing those involved would be just, but that act alone misses the point: why are prosecutors who behave like this thriving? This isn't an isolated case at all. There's a more sinister factor at work, and doing only as you suggest would cover it up.