We take kindly to these disappointments, especially if we are not well loved. So at the bottom of most hearts is a layer of resentment for the sacrifices social life demands of us, resentment for the loss of our hearts desires. Everyday existential resentment gets channeled into common irritation and anger at co-workers, family members, and other drivers. It also fuels hostile attitudes and actions against groups who are approved as targets by one's peers. Racist belief systems are frameworks of rationalization for venting resentment.
Some people come through happy childhoods with small and manageable levels of resentment.
Others who got no love no matter what they did, and those who were physically or emotionally abused, have great storms of resentment within. This makes them explosive, highly dangerous animals. Any real or imagined insult, anything that assaults their dignity, may set off some sort of violence. Now what I want to suggest is that the social system of makes these animals more dangerous still. Every social system requires some sacrifice of infantile goals in the interest of cooperation.