Again, you said they had no documents to apply for valid Indian visas. Second you pointed out that Bangladesh isnt paradise.
Let me ask you onething, if they are escaping a butchery, are they in any position to negotiate where they should be staying? They should be thankful that Bangladesh allowed them and provided them safe shelter. But what did they do? Lets cross border illegally and enter India. No matter how you look at it, they committed a crime corssing a border illegally. Mind you this happened back in 2012-13 when there were hardly any refugees in Bangladesh. In last month alone, there were almost half a million refugees in Bangladesh and they seem to be doing just fine, so one must ask this question, why did those 40K decided to leave Bangladesh? What were their exact motive? Even bangladeshi intelligence said some of them pose security threat, and India is only safeguarding her border.