There is no doubt at all that the Obama administration politicized the DOJ and the FBI; that was obvious with the appointments of Holder, Lynch, and Comey. So, yes, those departments are indeed suspect. However, that is why Trump is determined to clean them up.
The point is they are still going rogue and are answering to virtually no one, as Wray made clear today.
The hapless Judicial Committee did not even bother to haul Wray into a closed door interrogation, and Wray did not recommend a closed door hearing either.