I have no idea why kids today are so violent. We were hippie peaceniks. Flower power, love, and peace (man). We did have some upper class-men that we called beer-freaks. But they would just call you out to fight behind the Dairy Queen. Then they mostly wouldn't show up.
I probably did do some things due to peer pressure. Smoking, drinking, and shop lifting come to mind.
Sunday punching someone without warning was a cowardly act. No one wanted to be known for that. I did get Sunday punched a couple of times when I was in bars and older. Which sucked because the bouncers would run over and grab you so that you couldn't get revenge. Still a cowardly act in my mind.
"Blessed are the peacemakers, for they shall be the sons of God."