You'd be amazed at how little most practicing scientists are versed in rational thinking, statistical rigorousness, and the scientific method. Maybe a lack of proper math and statistics education?

I've since long lost count of the neuropsychology and biology papers I've come across that not only presented as fact results that did not really disprove the null hypothesis at all, but even advanced convoluted, ridiculous causal explanation for the (as likely inexistent) correlations they found.