That was no hoax. Mueller did NOT say there was no collusion, simply that it couldn't be proven beyond doubt in a court of law. Big difference. The guilty often go free, to ensure the innocent aren't convicted (and that doesn't always work either - ask Rubin Carter).
How civilized countries work is under the presumption of innocence. It was not Mueller job to prove something did not happen. It is their job to prove it did. Mueller: "We applied the term coordination in that sense when stating in the report that the investigation did not establish that the Trump Campaign coordinated with the Russian government in its election interference activities."
my2cents 