One of the most common arguments against a scientific finding is confirmation bias: the scientist or scientists only look for data that confirms a desired conclusion. Confirmation bias is remarkably common—it is used by psychics, mediums, mentalists, and homeopaths, just to name a few. As you may guess from such a list, deliberate use of confirmation bias is held in low esteem by scientists, and allowing confirmation bias to get the better of your results is regarded as a particularly sad form of incompetence.
Yet, whenever science meets some ideological barrier, scientists are accused of, at best, self-deception, and, at worst, deliberate fraud.