It is true that Han Chinese have been doing this to every non-Han ethnic group for centuries. There is even a special word for it: Sinicization It is a lot easier to control a population when they lose their diversity and identify as a single culture. Plus you can blame any problems on the outside group.
I've traveled to India and it seemed like I was always sick. Population is over a billion, everywhere is crowded, open sewers, eating with your hand, for a start. This chart for India makes perfect sense because disease flows freely in India. It is a grand experiment to see what happens naturally in an epidemic.
In our normal state we perceive only three dimensions. The animals and plants around us are the aliens. The highest religion is truth.