We seem to be living in an age of gurus. They’re all over the place, building large followings in domains like politics, self-improvement, spirituality, religion, activism, philosophy and even (occasionally) science. Gurus may not be more numerous now than in the past, but they seem to now more easily garner audiences of hundreds of thousands due to the fracturing of media, social media and YouTube. If you pay attention to how harmful gurus behave, you’ll start to notice patterns that come u...