Bringing criminals to justice does not mean trying and convicting in the press. They are putting at risk any court proceeding with their recklessness.
You are overlooking the fact that there won't be any court proceeding if she wins.
Both Obama and the AG are in the tank for Hillary, and Lynch's DOJ has used excessive grants of immunity, refusals to issue subpoenas, ridiculously easy guidelines for interviews, and every other tool at their disposal to ensure that justice is not done.
The FBI doesn't have independent legal authority to bring charges, and the Lynch-led DOJ is corrupt and won't do it. So what is the proper course of action for law enforcement officials who believe that justice is being subverted?
Essentially, they're whistleblowing on a corrupt DOJ. And good for them that they are doing so.