A nice video describing famous scientists who were right, but not believed.
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I like it because they explain some rational reason, like unserious clinical practices raised founded skepticism.
This recognition that being wrong was rational is seen also in Thomas Kuhn "The Structure of Scientific Revolution"
http://www.uky.edu/~eushe2/Pajares/Kuhn.html
Human factor is key to understand erroneous skepticism, and respect of both your own scientific rigor and other's skepticism is important on the side who is anyway right but denied.
Not talking of the mass of erroneous ideas pushed by people who were right on one key point.