It's mostly the folks in the middle who have (pseudo-secret) extremely partisan values which divest from those of the mission, but there are a few sprinkled in at the very top that are giving the orders.
The thin blue line needs to be crossed by the good ones- and it would only take a small percentage to break it forever. It's a cancer of justice, and is the root cause for myriad problems in the US.
I read Comey's book, and despite his attempt to look like a good guy, and self-aggrandizing he was definitely one of the bad ones.