Since everyone is still talking about how successful of an evil genius henchman Bill Barr was, let's catalog all the times he corruptly tried to help Trump but fell flat on his face:
Barr tried to get the case against Michael Flynn thrown out, but this effort failed entirely. Trump ended up having to pardon Flynn, to clean up Barr's failure.
Barr tried to get Roger Stone's prison sentence reduced to the minimum, but Stone ended up getting the multi-year sentence he was always going to get. Trump had to commute Stone's sentence, to clean up Barr's failure.
After Michael Cohen was let out on house arrest due to the pandemic, Barr tried throwing him back in prison to prevent him from publishing his anti-Trump book. But a judge quickly freed Cohen, who succeeded in publishing his book.
Barr tried to install his own guy as head of the SDNY, presumably to stop the arrest of Steve Bannon. But Barr blew it, the SDNY remained in proper hands, and Bannon ended up getting arrested.