Untouchability shuts all doors of opportunities for betterment in life for Untouchables. It does not offer an Untouchable any opportunity to move freely in society; it compels him to live in dungeons and seclusion; it prevents him from educating himself and following a profession of his choice.
Good Question Good Answers
Life and Mission of Dr. Babasaheb Ambedkar
Buddha or Karl Marx (PDF)
Buddha or Karl Marx (mobile)