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.
Even this breeds some resentment. But capitalism is not a system of cooperation. It is a system of competition. Moreover, it is a system of competition among unequals who are taught to believe that they are all equal in their chances for success. So it appears that those who fail have only themselves to blame.