So you worked for Barr before... What’s different this time? The fact that he is doing what hes supposed to do for an administration you despise? Perhaps the problem is you and the fact that you are a partisan when you should be indifferent to whomever is office. Your personal agenda is coloring your professional perspective. Its good that you are leaving, as you are no longer fit to hold the position you have held.
Rats leaving the ship...
Maybe he thinks indictments and subpoenas will come after the election and he decided to bail out.
Hopefully that is the case.