As I said before, nobody in his right mind will go for work in India unless he/she is lured by the sweet talking brokers. You better catch the brokers, then no one from BD will go to honey-soaked India.
In case of illegal immigrants from your NE and also from WB, they are coming on their own, because they know the language and local customs. Our people are not that jealous of these 500,000 Indians and do not encourage the police to catch and deport them. Moreover, many are the descendents of once BD nationals who had migrated to WB. We cannot just harm these people from WB, because basically they are our people.
Thinking of Indians and BD people are based on different philosophy. We believe RIZQ is given only by Allah, but a person has to earn this RIZQ by hard labour. So, when an illegal Indian immigrant works hard, Allah bestows him with money. People are not supposed to interfere in the matter of RIZQ by calling the police. Pet pe lath maarna ham bardasht nahin karte hai.
5 million BD people have left to work in foreign countries. So, there are shortage of labour in agriculture. Apart from the half million Indians who work for garments, there are thousands of other Indian seasonal workers who work in farmlands in our eastern border.
BD people think it is the wish of Allah that the Indians earn their RIZQ in BD. We also do not think, presence of a half million Indian will ever give rise to the possibility of Indian domination. Situation and people's thinking may change in the future. But, the present situation in BD is what I have stated above.