Sure, rage starts in the body, getting hopped up on chemicals with long names when some asshole cuts you off in traffic. But it's the mind that creates revenge fantasies, that puts a structure to the anger, that finds ways to make it seem okay, or even a good thing for you to hate people. Ain't it just like a prick in a BMW to cut me off. Okay, then name me an animal species, other than yours and mine, that indulges in intramural murder. Armadillos may be stinky little runts, but they don't kill each other.
Lions fight for dominance, but they let the loser slink away in shame, like a one term president.
I'm chalking that one up to accident, poor visual conditions, over-evolved aggressive instincts, and having a brain the size of a young boy's fist. So the spirit ain't so pure. The body provides the spark, but it's the brain that provides the fuel, the mind that nurses the flame, and the spirit that keeps it burning. Every enduring idea, from the vodka tonic to National Socialism, started out with an emotion but went the distance carried by the soul. Which brings us to the ghosts.