Part of it, I think, is the attempt to assuage the guilt of the affluent when faced with the homeless -- if we imbue them with magical powers, cast them as protectors of our comfortable existence, then we don't have to feel bad for them or DO anything about it.
At the same time, from a writer's POV, it IS convenient to have a character who can operate on the fringes of the society, who doesn't have a job to go back to and can be portrayed as free from mundane concerns of mortgage and money.
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At the same time, from a writer's POV, it IS convenient to have a character who can operate on the fringes of the society, who doesn't have a job to go back to and can be portrayed as free from mundane concerns of mortgage and money.