Why settlers seek validation from NE indigenous people?

It's a rhetorical question. I understand the political compulsion behind this question, especially from the Bangladeshi community. I DO NOT see such questions from say the Marwari community. What do these settlers seek to hear? NE people identify with their ethnicity above anything else (okay there are a couple of exceptions in Assam maybe). Do they expect us to say we welcome you into our ethnic group? Maybe in the past but it does not work like that in the present. Assam is very diverse. There is bound to be differences of opinion but 1826 as a cutoff is a valid view point. Other NE states would probably have different views on this. The UN (2004) definition of indigenous people is not much different from how we view it. Why do the settlers keep trying to force themselves in? Let's hear from the NE indigenous people.