The Clinton’s have been investigated for decades and the only thing that stuck was Bill lying about getting his pipes cleaned by an eager intern. There are no cover ups regarding Russia and the Clinton’s; it has been exhaustively investigated when the Republicans held house senate and presidency with nothing found. You will know if Barr is ethical when and only when the Mueller Report unredacted in its entirety is made public, and any and all crimes it discovered are thoroughly prosecuted.
Justice always prevails. Slowly but eventually.