Twitter has confirmed for me something I've always suspected: humans need to hate and ridicule just as much as they need to love. And even if you created paradise on earth, people would eventually feel compelled to graffiti over its walls.
Agreed. But we're on Twitter. Using terms like reptilian brain and Jungian shadow is shorthand for the sum total of neural mechanisms that are responsible for our more animalistic behaviors, all the lust and fear and rage and delusive dreams that lead us from reason.