Yeah, I mean in a way I can see where Koreans are coming from. Take a look at Europe--there HAVE been riots and unrest due to massive amounts of poorly-assimilated immigrants and yeah, that applies to second and even third-generation ones. Koreans might as well be honest about the fact that they're too socially insular to successfully assimilate big numbers of southeast Asian workers or, you know, English teachers into their society. Not every country can pull off multiculturalism, and the smaller and more collectivist of a culture you are the harder it seems, in my opinion. That's a sort of sacrilegious thing to say in the West, where any hint that multiculturalism is anything other than super awesome isn't PC, but it's my impression after living in Korea for awhile. I definitely think immigrants and temporary workers deserve protection and fair treatment, of course, and yes this article is sensationalist and it's kind of funny that (supposedly) 64% of Koreans are really that afraid of anyone who's different from them.
It's certainly interesting. What does multiculturalism mean, anyway? I think it should mean people of all different ethnic, national and cultural backgrounds living closely together and enjoying each other's diversity. But it seems like a lot of people don't
want to associate with people of different cultural/ethnic/racial backgrounds. Take a look at the average US city - completely segregated by race. Or some of the larger towns in the north of the UK - completely divided between white British and British muslim populations. I'm not interested in race or nationality as a signifier of who I want to associate with... but a lot of people are. And it seems that the end result is fractured societies (to an extent). (I honestly don't think there's anything lamer than assuming someone I've never met is "the same" as me because they have the same skin colour or passport. But again, lots of people all over the world disagree with me.)
On the other hand, what's the alternative? Unless Koreans start a) having babies and b) working in factories en masse they're going to have to allow mass immigration. The alternative is to do a Japan, keep foreigners out, and enter a seemingly endless managed decline.