@feel2death
It is not so much as a asian trope but that a portion of readers will feel better when their own country is shown as good or if they're criticizing the country from the beginning. Criticizing their own country has also be shown but it is from the beginning so as not to make a mess. But here the author has shown his own country in good light so won't suddenly show it as bad, which would break the plot to an extent.
Also this trope you mentioned isn't only to asian countries but is seen all around the world, it's just that the translations here are atleast 95% from asian countries.
Try reading some of the older novels from european countries and it would have africans as savages who need to taught how to be civilised and even in some stories to not eat their own.
Also plenty of American movies are the perfect representation of this trope where only america can fight and others are running around like headless chicken or only they're being attacked by some entity or organization.
As for the only MC is good, it is an OP MC story and he isn't the anti-villain what did you expect?