Social outcasts, by definition, are typically people who do not conform to the current societal standards, and therefore are "cast out" of the societal rankings. They, in a rigid societal class system, would be found outside the sphere of classes, and would be given little worth by society. However, as time has proven, social outcasts actually play an important role in allowing for such a social construct to be stable, as well as allowing for the rigid casts of classes to be put in place.
Social outcasts typically do not even register within the base, or the masses, and earn their rankings, are typically those who do not live up to the expectations given to the working class. For example, in the US, the "American Dream" had been the predominant expectation given to those of the working class, in which one owns a property such as a house and it's plot of land that it is on, with a stable income, and a nuclear family. A social outcast in the American Dream era would be one who fails to meet at least one, if not all of these points. However, that is not to say that the failure to meet one or another would register them as a outcast. For example, failing to form a nuclear family when one is in a long term relationship may be frowned upon, especially when one breaks away from the traditional and only marriage. Failure to be able to provide for oneself (as well as one's family if one has one), can also be used to prescribe a person as a social outcast.
Social outcasts, in my opinion, may not seem significant at first, but they have the ability to create change and destroy the rigid structures that benefits society. For example, in certain countries, the LGBTQ+ society members are placed under the social outcast categories, typically due to their beliefs of unnatural relations, which may lead to them being cast out of many different societal structures, especially those that are religiously rooted. However, that is not to say that they fail to meet the expectations physically, but only in a mental environment of failing to comply to the societal standards of that place and day. The rigid structures can always be destroyed by libertarian activities, such as protests, riots, and even revolution, which applies pressure to the system and forces a change, whether peaceful or not. The social outcast, in that effort, must be suppressed in order to keep the current structure failure-proof. In the end, one can summarize social outcasts as those who distort the vision a societal structure gives to it's people, and to either be broken by the system to follow it, or to be forced to change the structure in a way that benefits the outcast. It is important to note that no matter how accommodating a social structure may be, there will always be some sort of social outcast. After all, with flexibility and freedom, comes freedom of thoughts of malice, envy, greed, and protection of one's own interests. As such, social outcasts will always be a part of society, and can always be minimized, but never eliminated from humanity.
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