They didn’t restrict anything, they followed the law and classified items accordingly. Just because the government changed the law isn’t their fault, they have as much control over that as you or I.
They don’t get to work outside of the law because of ideology. Believe it or not to work in the firearms lab you basically have to be a gun nut. You pretty much can’t gain the technical expertise needed to work there without having a ton of personal interest.
I have a buddy who works there and I even turned down working there about 8 years ago. The problem isn’t the employees, rather the laws themselves. When our law is as vague and poorly written as the firearms act it ends up being pretty broad in scope.
Much in the same way sending soldiers to a war zone with crappy ROEs isn’t the soldiers fault for following them, rather the governments fault for the poor ROEs. The act itself needs to be changed.