TBH it does seem like a miscalculation. Just my opinion, but it seems like the assumption was that they were corrupt and slimy sewer rats, concerned with their jobs and orgs, but not likely to stick their necks out. In this situation it is good to keep them in view rather than someone who you are unsure of. The problem is it is clear the system is past the point of caring about appearances and is willing to sacrifice the last shred of dignity, and even let some heads roll just to hopefully get Trump out.