This repost seems acutely relevant given the recent Islamic State attacks on targets in Paris France. My basic (though wildly oversimplified take is that US military recruiters appeal to young men’s “inner comic book superhero”. US military marketing videos attempt to stimulate, in the hypothalamus, the production of testosterone. In contrast ISIS recruiting vids lean heavily toward th warm and fuzzy in big to entice young jihadi brains to produce oxytocin.