Ambedkar criticized justly, the caste system and untouchability,which has no sanction within the hindu scriptures, but which were created by the power hungry brahmins.
He was indeed a great man, who brought justice to the so called untouchables, and revived Buddhism, which is Buddhas variant of Hinduism, and is a sect of hinduism,minus the caste system and untouchability.
All Hindus should work hard for the eradication of all idiocies and superstitions in Hinduism, like the caste system and untouchability,which has no sanction in the scriptures , and is truly adharma and a violation of ahimsa as well.