Everyone experiences what I prefer to title "The Rift". The Rift is a gap between individuals which defines our social relationships. For example: when you go to the mall, or to any area in which a large number of people temporarily gather, you have the tendency to avoid communication with anyone who you do not already know. This "Rift" is caused by our lack of trust with one another; these people whom you have never met before are known as outsiders. Referring back to the basic ideals of humanity in the ideology of the "Tribe", each of these other individuals is from a different tribe rather than our own. They have no biological or social link to us as the individual. We are even less likely to associate with groups of unknown individuals in these settings. Due to being clustered, we have a more definitive idea of their membership to a different tribe rather than our own, as well as with the possibility that we lack the traits that have brought these people together as a group. Self preservation in this case also comes into play - one man could not protect himself properly against a group (though in this modern age we must factor in a variety of other variables, but for the sake of argument we shall exclude these).
Every single human being has placed his or herself within a group of some type. We are citizens of nations, coworkers, friends, and family. These are all based upon similar traits among said group's membership. Nations are based upon geographic location and citizenship (a physical representation of which group on this scale you are a member of). Coworkers all have the same company and job in common. Friends have a variety of traits in common that usually involve goals, physical traits, beliefs, or ideas. Family members share genetic material and typically are similar due to this, given the hereditary nature of a number of our characteristics.
Yet, it must also be realized that each of these groups contains its fair share of "black sheep" - those who deviate from the norm of said group. The black sheep are typically partially excluded from their group, whether on their own accord or that of the other members. They remain in their group due to being unwillingly placed into that group, positioned into the group yet being disliked for other characteristics besides the common trait, or having found a group in which they are mildly appreciated as they continue on their path to find a group in which they may finally settle within.
Every single human being has placed his or herself within a group of some type. We are citizens of nations, coworkers, friends, and family. These are all based upon similar traits among said group's membership. Nations are based upon geographic location and citizenship (a physical representation of which group on this scale you are a member of). Coworkers all have the same company and job in common. Friends have a variety of traits in common that usually involve goals, physical traits, beliefs, or ideas. Family members share genetic material and typically are similar due to this, given the hereditary nature of a number of our characteristics.
Yet, it must also be realized that each of these groups contains its fair share of "black sheep" - those who deviate from the norm of said group. The black sheep are typically partially excluded from their group, whether on their own accord or that of the other members. They remain in their group due to being unwillingly placed into that group, positioned into the group yet being disliked for other characteristics besides the common trait, or having found a group in which they are mildly appreciated as they continue on their path to find a group in which they may finally settle within.