If H1B workers or immigrants are so skilled why don’t they fix their countries?

It’s one thing to be born in a country that’s a warzone, but India is not a warzone, and according to Indians India is a world superpower, the Chinese also say the same thing, yet they can’t help but want to immigrate to the West

If your countries are so great why are you so desperate to leave them?

The way I see it there are only two logical explanations for this:

1. Your countries are not actually great but you are too prideful to admit it (so you are lying)
2. Your countries are indeed great but you are lying about your motives, which sounds like something an invader would do to make things easier for themselves

If there is any other logical explanation please let me know