Berger: Sociological Analysis

Berger explains that psychology deals primarily with the individual psyche while sociology deals with the patterns of social life. How can the difference and/or overlap between a sociological perspective and a psychological perspective be related to Gilroy's concepts of an individual identity and communal identity?

Gilroy

Gilroy states that "differences exist within identities -- within selves -- as well as between them, " and therefore "the longed-for integrity and unity of subjects" are always fragile. What would be some real life or media examples of this theory? What type of difference might result in this fragility?