@Oscar sb
Surprised to see a commentator of your stature make such a comment!
They are pushing ethnic and religious demographic replacement
Kashmir- Most of the immigrants are part time labour who are working on projects. They will go back to the next project that their employer/ contractor is working on.
demographic changes internally in South Indian regions which are holding out to BJP- These demographic changes are autonomous, naturally driven and will happen irrespective of which party is in center. The Deep South states have now entered a phase of very low TFR (less than 1.6 for TN and KL I believe), ageing population and have large emigration of skilled manpower to the US (TN, AP) and the Gelf (Kerala). They have a vibrant economy and need large scale unskilled labour which the North, WB and even BD are providing.
Regards