Knowing my enemy, and knowing my enemy is so like myself.

"Tribes thrive in adversity. Their poverty is their strength." Steven Pressfield

http://blog.stevenpressfield.com/

In my experience with fighting forces, and the peoplel who comprise their numbers I've realized this many times but never expressed it aloud. Enemy mine is a reflection of thousands of years of tribalism distilled into several different iterations, and playing out now for our consideration all over the world.