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I knew a pastor who drove a navigator (when they just came out) and walked around in aligator skin shoes and 3 piece suits all the time... He even had people around that would shine his shoes as he walked from place to place INSIDE the church.
I'm not trying to hate on churches, but some of these "pastors"....

Science is about interpreting data. And while data is not not biased, the way we gather it and the way we interpret it can be. Scientist strive to control these elements, and to interpret data as objectively as possible.
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Sometimes data stands on it's own. By that I mean it is a new piece of information about something relatively unknown. In cases like that it's is entirely possible that data is misinterpreted, if only because we don't know where to connect the dots.
That's why follow up studies are done to support the theory. The more follow up studies support it, the stronger the evidence is that the theory is correct.
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Chances that (all) well-established and supported theories are wrong are slim. They may not be the whole truth, we may find out something later that will add to it, or change out view of the data collected, but they are no fabrications. Not by any means.