Jimmy Porter's anger stems from feeling alienated and helpless in a rigid class system. The real power and opportunities are for those people who were born into money and have the right family connections. These are the people who get treated better than everyone else just because their families are the "in" crowd of old money and influence. Jimmy is from the working class and isn't given the same opportunities as those from the "Establishment". The opportunities for power are not available to him because he isn't from the right family. He sees people like Nigel, who is "stupid and insensitive", has no beliefs of his own, but will make it to the top just because he was born into a wealthy family with connections. This makes him angry. He has a degree, but it isn't from a respected university. The social and power structure of society is closed to him, and Jimmy can't accept this. As a result, his anger leads to violence. He doesn't seem to fit in anywhere, and he lashes out in anger because he feels helpless to change the way it is.