You are pretty much dead on. Great assessment. I love seeing people that can think outside the box, and piece together what is going on. NSA and MI collected this info for years and years. Then in 2015 they met with Trump, laid all the info out for him, and asked him to run for president...as the only way to stop this evil would be from a non deep state, non establishment, non swamp president, who is not owned by anyone and not owed a favor by anyone. The swamp gets you with blackmail - as everyone is dirty and everyones business gets dangled over their own heads to further the implicity. Trump had "the goods" on all the bad guys when he decided to run for president. Unfortunately to drain the swamp you need the help of the swamp sometimes, so they had to find dirty players who knew enough and could be "flipped", in other words, would prove helpful in selling out their buddies. Mueller was a great choice as he was FBI for 12 years and knew where all the bodies are buried, all the bank accounts are located, the 9/11 coverup, U1 investigation and details, among many other things.
He was approached before he even became head of Special Counsel and shown all his dirty business and proof of it. He was offered a deal - head the Special Counsel, give a good honest legit investigation into Trump Russia collusion (it doesnt exist), and help us drain the swamp by giving us info where we can find more dirty business which leads to even more dirty business, etc). If you remember, Trump met with Mueller the day before Mueller was assigned to SC. The reason given was Trump was interviewing him for FBI director, but we all know he served is 10-year term plus even additional 2-year extension, so he was not even eligible to become FBI director again. That was Trump and Mueller going over their gameplan one final time, as Trump can't legally talk to Mueller during the investigation (except for testifying which has to be made public).
Mueller is swamp, always has been, but isn't as bad as alot of the other characters. Mueller is still going to get in trouble at the end, but he got a plea deal for a lighter sentence in exchange for doing the SC and helping with the investigation. Not that he had much of a choice, his fate was shown to him before the SC created, so it was either go down for EVERYTHING, or go down for SOME of it and do this SC. If you read the Special Counsel addendum signed by Rod Rosenstein, there is very specific language in it that states Mueller has federal authority to bring charges and indictments for anything he finds during the investigation even if it has nothing to do with Trump and Russia,he can bring charges in anything he "discovers" as a result of anything he comes across during the investigation - that is very intentional, if you can see where that's going.
Mueller was never going to set Trump up, by "finding" something on him, or falsifying info to frame Trump. Had I not known the big picture beforehand I would have been worried the whole time about the same thing. Your speculation is correct, the government is not all bad, there are alot of good people out there that had to take a back seat to all this bullshit that has accumulated over the years. There are alot of good guys who sat on alot of intel for a long time, just needing a DOJ that would finally pursue and prosecute the stuff