In economics, we learn about cost/benefit analysis. Prosecutors/investigators cannot go after every potential crime, and even the bigger crimes aren't necessarily worth going after because the cost of investigating/prosecuting can be extremely high. The mandate in the Mueller probe was very vague by normal standards (look into any 'links', and anything else that comes up in the process). The end result will be two years of fishing and some very minor indictments/convictions unrelated to the aforementioned 'links'.
Two years ago I posted here that the best venue for the investigation would have been a nonpartisan commission, similar to the 9/11 commission. I got this idea from Alan Dershowitz. I still believe, strongly, that this would have been the right way to perform the investigation. If any potential criminal wrongdoing were uncovered, the commission could refer the matter to prosecutors. The advantages of that system are many-fold.
I will grant that there is a benefit in this probe that extends beyond direct cost savings and deterrent effects. Namely, there is a significant portion of the US population who was absolutely convinced that Trump committed 'collusion'
and who trust Robert Mueller. If the Mueller investigation had not occurred, many of these people would live forever in conspiracy land. As
@Jack V Savage has stated, widespread belief in vague conspiracy theories is a danger to society and human progress. The primary benefit of the Mueller probe is to assuage the concerns of these people. I don't think the non-partisan commission could have achieved that. No doubt, some will still insist that Mueller was biased because he is, after all, a Republican. By and large, however, I think the Russia collusion conspiracy theory will die off and the anti-Trump people will mostly shift their attention to SDNY.
I plead innocent. I am anti-corruption. I favor multiple constitutional amendments to expose lobbying to the public.
I do want them to be prosecuted, so long as the investigation/prosecution passes a cost-benefit analysis.
President Clinton "I did not have sexual relations with that woman"...process crime, not worthy of prosecution.
Roger Stone saying he wasn't aware that he was in possession of any "e-mails/texts/documents concerning the allegations of hacked documents or discussions about Assange"...process crime, not worthy of prosecution. Maybe not even a crime.