Survival
The person across from you right now,does not wish to have a spirited debate with you about the price of rice futures in Zimbabwe.
If he has a brain in his head, he wants, on the other hand,to cave your freaking head in
The best way to make sure that doesnt happen,is to cave his in first.
Ive never looked across the line when I played US football, and thought the left tackle wanted to do anything but put me on my ass.
It happened once, and I hated the feeling of being pulled off the field for a play, the guy bulldozed me, and I never wanted to feel that way again