We all know D.C. was corrupt to the core before Trump ever showed up in D.C. No secret there.
What matters now is the FBI, and other governmental agencies have been caught conspiring to setup, frame and undermine a Presidential candidate and President of the United States.
The point is: Give a Federal agency powerful, secret, monopolist powers of investigation, information gathering, intelligence, investigation and prosecution - and don't be surprised if that power gets abused. Lo and behold - it has been abused, for many, many decades.