Because people became arrogant over it. The whole concept was alot like the human body, arms,heads, shoulders etc. People could casually swap around "castes" as it was nothing more than an occupation, but over time (like all things) it got corrupted and more rigid. That's where the whole high Caste/low caste thing comes from. Guru Nanak Dev Ji in his infinite wisdom, decided to just do away with it. Problem is people still don't know the origins of it and thus decide to continue holding on. Caste is completely false anyways.
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