> Countries have the right to cultivate this feeling among their citizens.

I disagree, because what seems to always be the logical next step is "My monoculture is superior, and deserves dominion above your monoculture, which deserves eradication. And oh by the way, if you don't like our monoculture and try to escape it, we'll invade that place too."

That's kind of what the "mono" in monoculture implies. Multiculturalism isn't an asset because it's the most stable form of soceity, rather it's best we've figured out when the alternative is bloodshed between warring tribes.