The need to have an enemy?

My original purpose in having this blog was to communicate the humorous, or at least what I hoped to be humorous. I find my posts of late to be straying from that charter. This is another of those.
Have you noticed within ourselves the need to have an enemy? Not necessarily a person, per se, but often abstract concepts? I think that many people of varied backgrounds may agree on this, whether they believe it is a vestige remaining through our evolution from animals who were in constant conflict to stay alive, to those who may call it an element of original sin.
An example of this attitude is the feelings some people have over sports teams. Have you, like me, been appalled at behavior at sporting venues when you go to see a game? Or shaken your head at what you hear about football matches in Europe where rioting occurs? There have been stories of people murdered after they perform poorly in football matches. I remember one in particular in South America.
Does anyone remember Mitch Williams? He was a closer in the World Series that gave up a winning home run to the other team. I remember reading how immediately afterwards fans pulled up outside his family's home to spew their anger and hate at him. They were harrassed for some time after that. He was never the same player after that World Series experience.

I think some of us need a place where we can direct our anger and frustration at the world, and sports and politics are a frequent way to do that. I see it in my own life. I'll give an example of a sports team. There is a university that I will not mention that has long been a lightning rod for my anger and hate, and admittedly it is foolish of me. It started when the people I knew from high school who were going there were complete jerks and enemies of mine. It continues to this day, when I can freely say that of all of the people I have met who have attended this school, only one can I say to have liked. The others have a mix of arrogance and sports' obsession that tend to push me away.
Still, whether I believe I have reasons to feel this way or not, I don't really. It's a silly "outlet" for my anger that does nothing more than to fan the flames of all of those parts of myself that I want purged. Rather than being an outlet to vent, it actually makes things worse. This is true for more than just sports teams.
Again, for me it seems that when people attack my beliefs or things that I have expressed an opinion about (whether it be TV shows, books, music), it will often come across as a personal attack on me. Is it really? Usually not, but most of the time that doesn't stop me from feeling that it was.
What is my point to this? I guess that I have a lot of work to do, that even being aware of this part of myself doesn't mean that I can stop it necessarily, though they say admitting the problem is at least a first step. But I think that this is a problem for society at large, maybe not to the same degree as it is for me, but maybe for some a bigger problem. I hope and pray that we as a people come to recognize this part of ourselves and not let it overcome us.