I am going to add something circumstantial. Every investigation of the clintons has resulted in no punishment or indictment (you can say the articles of impeachment, but he wasn’t removed) Since there are dozens of allegations against them many with substantial evidence, it is fair to say that there was a pro-clinton force behind the foster investigation. Since they cleaned his office before the cops came and since nothing came out of it, I assume that force was the clintons themselves.
Which is EXACTLY what makes Kavanaugh compromised at best.