In a field office the FBI agents who may sometimes work for a living would diregard political pressure and look for the truth. In the DC headquarters, there are very few real agents and mostly the career politcal administrative types. Everything they do is done with a finger held high to see which way the political wind is blowing. Since all of the highest DOJ officials are there looking over their shoulders and they are all regime appointees, this will be a whitewash.
I see your point.