migrants, untouchables are totally different entities… politicians and western countries fuel division in Hindu society just like they did between hindu and muslim before independence.
the so called untouchables which appear only in media news (and it’s like honour killing or shia/sunni news etc..) no one in modern cities or who is slightly educated care about others caste. and these cast are part of Hindu religion only.
The assam migrants are Bangladeshi muslims who came to india illegally. (illegally b’cos they came after 1971 war, during the war time being part of UN india had to allow them to come )