This is all a red herring. India has a population of nearly 1.4 billion. The number of illegals you might have is probably about the number of 'illegal' pigeons which sometimes get trapped in my conservatory. Very, very, very few. The vast majority of the so called 'illegals' are natives. The two drivers of mass migration are war/persecultion, economic. The economic gap between India and neighbouring countries is insufficient to cause much migration. Which poor would want to migrate to India and pull rickshaws? Certainly non in Pakistan. I also refuse to accept that Bangla migration is as big as claimed. Again economic differantiation is not large enough. I doubt West Bengal is land of honey [Kolkatta appears to be hellhole with poor pulling rickshaws] and Bangla starving next door.
The odd Hindu Pakistani, Sikh Afghan or few other outlier do not even constitute 0.00000000000001% of Indian population given 1.4 billon pool. It's like a drop in the Atlantic Ocean. Yet the freakin drama created by India is as if it is Norway being invaded by mass migration. This is all distilled bullshat that only your media and dumb people lap up.
We in Pakistan have far, far greater number of migrants from Afghanistan, India, Bangla [they landed here in 1980s when economic differantiation was large enough and Pakistan is on the route to Europe] etc. Don't forget Pakistan's population is smaller. There is lot of illegal migration but I have yet to hear of them jumping trucks to the east. Even retards look to the west. Yes west.
But meantime keep feeding yourself this delusion.