I don't think anger is the problem. When you look at it, anger is just an opinion, a position; it is not an action. I think a lot of the problems we see in our society that are rooted in anger are simply a lack of self-restraint. For example, your brother wakes you up three hours early singing at the top of his lungs (not a pleasant sounds to wake up to in the morning). There's nothing wrong with being angry about that; I don't like to get up in the mornings at all, much less three hours early. Now you could get up, close the door, try to go back to sleep, and write about how you were tired and groggy all day long in your journal that night. Or you could freak out, have a big fight with your brother for being annoying, an even bigger fight with you parents for siding with your brother, and end up tired all day from not going back to sleep and grounded for the weekend.
When we look at society at large, expression of anger becomes an even bigger problem. People will completely shut off their minds to other ideas and publicly make fools of themselves just because they are particularly aggravated by a certain topic. No matter what your opinion is, everyone has the responsibilty to gather all of the information they can, listen to as many slants on a subject as possible, make an educated decision, and then express it in a respectful manner. I'm not asking anyone to change their mind or agree with everything their told, just to practice some self-restraint and open-mindedness.