Here's the reason they stopped the prosection of him:
Federal authorities preferred to let Roh go free rather than have the ruling become final and potentially create case law that could have a crippling effect on the enforcement of gun laws.
Under US District Court Judge James V. Selna's interpretation of the law, convicted felons and other people prohibited from possessing firearms would be allowed to legally acquire all the parts necessary to assemble an AR-15-style rifle and other weapons
So yeah. Let one guy go free who isn't going to cause much more harm because he now knows that he is under constant surveillance -- instead of letting tons of people acquire parts who are convicts.
Or... ATF could change a definition, and correct both issues.
Do you really want the precedent set that the ATF can just redefine what is legal and not legal? I realize to a certain degree they already do, like for example with bump stocks, but that I think was a dictate via executive order if I remember correctly.
I read the article, and it says the person in question had the buyer press the button themselves which would engage the machine to mill the lower receiver. Under the law, that means they manufactured it, not the guy who owns the machine. They could have maybe charged him with some lesser crime of facilitating felons to manufacture firearms or something like that, but technically what he did was actually legal. They dropped the charges for 2 reasons. First of all they don't want people to realize that what he did was legal by pursuing the case and losing, and also as was already stated it would set a precedent legally, making it harder to bring these kinds of cases into court in the future and just hoping for a plea agreement. There is a lot of misdirection going on to distract from the fact that this is a loophole in federal law that could be abused. A lower receiver has always been a "firearm" according to the law and ATF. This exact scenario was predicted a long time ago when Defense Distributed released their "Ghost Gunner" lower receiver milling machine.
Anyways, I know you are a LEO, so I assume you probably want the 2nd amendment rights of US citizens protected, but also probably by default want to support law enforcement organizations, especially considering that you are probably one of the first people in line to get shot at in an enforcement action. I in general support law enforcement, I am not one of those people who think its trendy to hate police, but I also think they collectively have been getting out of control on a systemic level, and been lacking accountability to a large degree. The ATF itself has lots of dirty laundry. I wouldn't want a federal bureaucracy redefining firearms laws. I am interested to hear your analysis of this.