Years ago, I had an investigative job which took me to various courthouses around the NY Metro Area on a somewhat regular basis (mainly to get duces tecum subpoenas for medical records 'so ordered' by a judge). I remember taking great inspiration from the inscription about the New York County Courthouse:
For those who don't wish to squint at the photo, it reads 'THE TRUE ADMINISTRATION OF JUSTICE IS THE FIRMEST PILLAR OF GOOD GOVERNMENT'. Words to live by, if you are interested in good government. Those who see government as an obstacle to their private gain are uninterested in the true administration of justice... so here we have over a thousand former Department of Justice employees calling on AG Barr to resign. Barr is not interested in the true administration of justice, nor in good government- he's a bagman for oligarchs, trying to garner preferential treatment for the president's cronies.
Right-wing dead-enders often talk about a 'Deep State' that is undermining the Trump administration. In reality, the people who constitute the 'Deep State' are the largely non-partisan public employees who keep things running in government agencies. These are the men and women who deplore seeing the agencies that employed them degenerate into political machines for corrupt regimes. Barr isn't going anywhere, and there really isn't a mechanism to get rid of him at this time, but it's important that his misdeeds are noted, for historic purposes. Hopefully, we'll get through this rough patch for our nation, and keeping a record of how our norms were violated is an important part of warning future citizens that the mistakes of 2016 don't get repeated.