Another reason some ATF people need to be in jail,

let's consider falsifying evidence, tampering with evidence, and lying under oath to put someone in prison.

Putting them in prison, general population, sounds reasonable as punishment.
In a letter sent to someone not involved in Adamiak’s case, The ATF explained the RPG training devices.

“The sub-caliber RPG-7 training devices previously evaluated, like the ones you mention, typically contain a barrel chambered in 7.62x39mm, possess a firing mechanism including a striker, sear, and trigger device. Its intended use is as a subcaliber insert training device for the RPG-7 anti-armor projector. However, the design of the device also allows it to be fired without the use of an RPG-7,” the ATF said in the letter.

The ATF also never mentioned that the entire device—an RPG and the 7.62x39mm training device—were sold to the public on GunBroker.

“This one’s been modified a little to color within the lines of the National Firearms Act of 1934. First, it can’t load or fire a live PG-7V or other rocket-propelled grenade round, only the subcaliber device. Second, ATF interprets a subcaliber device as a ‘firearm,’ not any specific kind of firearm, but installing it in an RPG-7V, even one that’s been modified so that it cannot fire live rounds, creates a ‘short-barreled rifle,’” a Loadout Room story states.

This offer was not an experiment as to whether ATF would approve the sale. The entire device had been approved by ATF’s Firearm Technology Branch, and the seller had the ATF approval letter, which they included in the kit.