You know as well as I that data can be manipulated. data may always tell the truth, even manipulated data, even manipulated data from stacked studies, but the way in which that data is used is almost always about what will make the promoter $$$ or get that next grant etc. etc.
BTW, I am not much of a Conspiracy theory person, though some conspiracies may be based on truth or an understanding of that truth, I believe that most of what occurs in today's world is, for the most part, about power and money; more importantly, hanging on to it once it is obtained...