I have always wondered this. In US left wing groups are always outraged about treatment of illegal/undocumented immigrants. Why is there no outrage how legal immigrants are being treated in US?
There’s also not much interest politically to make it easier for Indian immigrants specifically. For folks who have already immigrated, they have a “I got mine, fuck you” mentality, while the people in the process itself can’t vote and influence political decisions. The community of Indian Americans is also not large enough to have extensive networks similar to that of immigrants from South/Central American nations.