Mueller chose a hyperpartisan team of Democrats. Texts of his team members show bias. He’s close friends with one of the principles in the investigation (Comey) yet chose not to recuse himself (that is highly unprofessional btw). Multiple politically timed leaks. Dirty investigation tactics - going after targets lawyer and blackmailing him into giving him what he wants with the threat of jail time.
Mueller has no credibility other than on the Left. We all knew what Mueller was going to find even before the investigation.
He will have to find that there was no actual collusion because he can’t make up evidence, but he will word it such that you libs can pursue you grassy knoll for years to come.
Mueller never wants this to go to trial or other investigation, or his work will be double checked. Thus he will smear and imply, but not actually find anything.