H1Bs get citizenship, and they raise their children in their home cultures. My parents are citizens and have been voting for decades. But they still think and vote like Bangladeshis.

I’m not saying it’s some written-out plan. But look at how left wing Indians and Indian politicians in the U.S. are compared to say German Americans. (Socialism was a founding principle of the modern Indian state.) People in the party are acting according to their incentives.