Statistics say that false conclusions are inevitable. See http://www.marginalrevolution.com/marginalrevolution/2005/09/why_most_publis.html
Peer review guarantees nothing.
– Peer review
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Cognitive bias, being a natural human tendency to save time and mental energy, is a large, sometimes dominant factor in irrational methodology and conclusions. The most common form of this error may be confirmation bias. Cognitive biases are likely to be defended by invalidation of the questioner as if that person were an accuser. For example, in Tom Nelson's Ivory Bill Skeptic blog, he had to contend with constant attacks on his character and with threats.