Steve,
Just a thought. Is it possible that aggression has a stronger correlation with youth and maturity than it does with any other influence?
Being raised in a strong traditional Christian home I was taught the ways of kindness and even humility by turning the other cheek now and then. In grade 3 after coming home with a black eye after catching the wrath of the schoolyard bully, my mother thought it best that I learn how to defend myself, and that I build my body accordingly. By grade 5, I know that I had achieved the respect of my peers by competing in phys.ed. wrestling tournaments. By highschool I was known as the person that preyed on bullies. If there was someone that was known for picking on those that were weaker than themselves, I would make it a point to confront that person. I was well liked for that quality and became very popular because of it. I got into boxing, joined the highschool wrestling team and played on the other 'tough' sports, rugby and football. By the time I started frequenting bars I had the reputation of the guy that finished fights. I never started them, but I was too willing to finish them.
In my mid-twenties I started bouncing for a friend of mine at one of his nightclubs. It wasn't until working that position that I started to respect my own (in the little world of nightclubs) did I start to respect my own power. Not physical power. But mental power. The ability to control my rage, while fulfilling the requisites of my job. To further suppress my aggression it wasn't until I had a child that I was given the ability to levy patience. Plenty of patience. Now that I am a bit older, it's not that I am incapable of dispensing aggression, it will surely come out if I am cornered, but now I find that I have the ability live out those qualities I learned when I was younger.
Maturity is a wonderful thing, unfortunately it comes at different stages. Even more unfortunate... sometimes it never comes for others.