One of the big problems that many people have in understanding the state of politics in the United States is that they get trapped in the false paradigm of binary thinking. This is true both because people have been conditioned to believe that politics and political philosophy are divided between two "sides", and that you have to be on one side or the other. There is absolutely no contradiction in believing that Trump and most of his team are a bunch of corrupt, amoral scumbags and that Mueller is a corrupt, incompetent, authoritarian member of the police state. Those of us who have paid close attention over the years know Mueller bungled countless investigations during his tenure at the FBI, perhaps most spectacularly during the anthrax investigation, where his ineptitude led to the deaths (through suicide) of more than one innocent suspect.

https://www.ocregister.com/2017/05/21/comey-mueller-bungled-big-anthrax-case-together/

It is possible (and I would argue intelligent and informed) to take the position that Trump is (and has always been) an extremely corrupt tax-dodger who may well have engaged in money laundering and other crimes while also believing that the FBI is corrupt and engineered the Russian conspiracy nonsense in order to ensure his belligerence towards Russia and to discredit his presidency. These are not mutually exclusive ideas. Just because Trump is probably a criminal and willing to do criminal, underhanded things doesn't mean that he is a Russian spy or that he conspired with the Russians to leak the secrets of the corrupt DNC to the world. That Mueller is digging up crimes of money laundering, tax dodging, and stupidity (talking to the FBI without a lawyer - let along lying to them) on the Trump crowd has absolutely nothing to do with the election. Anyone who thought that a thorough look into Trump's past (and the pasts of his corrupt crew) wouldn't turn up crimes was delusional. That has nothing to do with the fact that the FBI and various other police state agencies and their cronies (like Mueller) aren't a far greater danger to the integrity of our country and our democracy than Russia, Trump, or anyone else.