I'd say they're all conspiracy theorists. Some people (like you) are just wired to embrace nonsense, no matter the level of lunacy required to make the conspiracy theory real.
I used to be a conspiracy theorist myself, buying into the JKF Assassination stupidity, UFOs, and I still hunt ghosties from time to time. I know the game you're playing. I can find "experts", some with PhDs, others with otherwise solid reputations in logic that back whatever silly conspiracy claim I care to make. The main roadblock to making any of these things true are the facts, and key elements that cannot be waved away with the whole, "You weren't there so you never really can know" line of crap. Just because they had a PhD, or have years of experience doesn't AUTOMATICALLY make them right in their assessments. In the case of JFK I bought into the so-called ballistics experts claims of a second gunman, and because of their backgrounds in law enforcement, and military experience I never questioned their judgement...until I went to Dallas and stood in Dealey Plaza. At that moment it was clear those "experts" were either lying, had not been to Dallas in person, and or are subject to confirmation bias to the point of mental illness.
No matter the disaster there are always "qualified" individuals who either genuinely question an investigation's findings based on their interpretation of the facts, or the question the findings because they are hardwired to be a-holes. Bjorkman is the latter. In the case of the former, I do get where some of them come from, intellectually. For many engineers, and other qualified experts it can be hard to accept a specific system failure initiated by a seemingly random event, or component within that system. Major Edward Murphy Jr. wisely stated, "Anything that can go wrong, will go wrong". And there are ten rules of Murphy. The other two which apply to the MS Estonia are: Nature Sides with the Hidden Flaw, and "Of all the things that can go wrong, the one which causes the most damage will go wrong". The problem with these few "qualified experts" is they can't embrace Murphy's Law(s).
My lone qualification in this case is I can break anything through common use. I am the 2% Guy who can crash your computer, fry the electrical system of your car, break/jam your doorknob. I even broke a hammer once. When I look at the JAIC all I see is my counterpart sailing his ferry too fast in rough seas because he'd done it one other time without problems, and he had a schedule to keep.