This article was originally published at the defunct Insight blog at Skeptic.com on June 6, 2016. An archived version is available here.

A recent Scientific American blog post raised a very tedious and very old complaint about scientific skepticism—in essence, “Paranormal and pseudoscientific claims are trivial. Why don’t you do something I consider important?” The answer I expressed in my previous post is that fringe beliefs are a significant part of the fabric of human existence, and yes, sometimes important in their own right. Seeking to understand those beliefs is a worthwhile research endeavor.

This brought to mind a more interesting question: why does modern skepticism seek to study such a broad and seemingly heterogeneous group of topics—everything from UFOs to climate denialism to mermaids to quack cancer cures?
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