We'll have to disagree there. I'd much rather be called names than be complicit in the demographic replacement and genocide of my people. I'd even argue that crossbreeding would be more catastrophic for the South Korean ethnicity than population decline. The latter is recoverable as the stock of the nation remains intact, while the former permanently alters the genotype of the population - even if the numbers recover, this is not fundamentally the same people as those who existed before.