Question

why untouchability is regarded as a social evil

Answer 1

Untouchability in India, is a practice where a particular community considers even touching another community person as polluting one. A person who touches the untouchables are usually made to undergo cleansing process, like bathing, or spraying of water, depending on the regional practice.

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Answer 2

Because it has become a Threat to equality and it is one of the main cause of discrimination.