I don't think sending federal agents to polling stations is a part of "doing nothing". That's why I just can't take this doomer shit seriously.
Barr is an advocate of unitary executive theory (the novel idea that the president, the head of the executive branch of government, should have full control over the executive branch of government), and the executive branch is currently headed by Trump, so think. Given that Trump is going all out on this being fraud, what exactly is the rest of the executive branch doing at this time? I can't honestly believe that the entire rest of the executive branch is full of deep state Never-Trumpers, because that's frankly absurd - it would mean that Trump would constantly be getting "locked out" of doing anything in his own "home turf" of the government, which is self-evidently untrue.