Read the article - they go into some depth on how even well intentioned researchers can get things way wrong. In this case the problem was a really stupid mistake - anyone could have caught it had they read first, published later - but virtually no one did. A big part of that is this perverse race to see who can hate Trump the most - the rest is a combination of extremely poor science education (theories no one uses, check; methodology, nah) and pure laziness.
Yet we make policy decisions on equally crappy footing - we laugh at people who think the Earth is flat but ignore our own inability to understand polling methodology. Which one do we base policy on?
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