I don't know who Rive is, but Holder never did what Barr seems to be doing. Obama didn't have scandals like Trump does so the comparison isn't really apt, but let's go back to a scandal plagued Democrat: Bill Clinton. What if Ken Starr had finished his report and then Janet Reno, Clinton's Attorney General, had issued a four page summary giving no details of the content of the report but saying that it had not concluded that Clinton had committed any crimes. That summary would have been technically accurate since the Starr report did not draw conclusions about crimes Clinton may have committed. But it also would have been highly misleading since the Starr report contained lots of evidence of suspicious, and possible criminal, activity by Clinton. Then suppose that Reno had rebuffed a Republican Congress in their efforts to get the full report and only released a heavily redacted version after publicly endorsing a liberal conspiracy theory about the report.