Who said that we will ever know for sure that Mueller/Rosenstein/Comey was charade ? The masses would then never believe that any prosecutions are legitimate.
My guess is that will never be confirmed to the masses if true.
IMHO I don’t think “charade” is the right word, if indeed M/R/ and even Comey are playing roles (don’t know about Comey, he has baaad history but may have been basically given an offer he could not refuse to do good), they were actually doing the investigation into Trump/Russia, it just was that there was nothing there. And Mueller was given the task of following any crimes he found evidence of, so if the evidence led to Dems - he was just doing his job!