India is a massive nation. It should quit being petty and give BD its fair share of water. In this respect Indira Gandhi was admirable. So was Morarji Desai.
We have started profiling them. The illegals are Hindu Bengalis who had migrated in 50's and 60's. Among the legals there is hardly any Bengali. They are employed for some skill / qualification.
Change your glasses. I have always said one mlln illegals in addition to another million legally employed Indians. They send huge remittance back home - probably the highest from any single source.