I found this article interesting (thanks Autoblog). It says that Korean automakers are delaying introduction of their own hybrids because they're not sure they can make money off of them without government subsidies--and if they get government subsidies and lower their prices, they may be subject to international trade restrictions.
They might sell them without subsidies, but then they could be subject to anti-dumping laws if they took losses. If they charge prices high enough to make a profit on each car, they might go unsold. What a mess.
If someone offers you something for a low price, you should buy it. You need not ask "did someone else subsidize you to make the price this low?" The answer to the question is irrelevant. If Koreans want to pay taxes to their government so that we can have cheaper Korean hybrid cars, then I am mighty appreciative. I don't think the Koreans are doing themselves a favor, of course.
What of the cost in lost American jobs? Again, suppose someone offers you a cheap car. Do you say "but I wanted to work the extra hours to pay more for that car"? Of course not. Some of the labor income that would have gone to pay for that higher price can now be used to buy something else. So it is with jobs. We would have used resources to produce more hybrid cars without the Korean subsidy (or we might have purchased more expensive Japanese hybrids instead). Thanks to the generosity of Koreans, our workers can build other things instead. We're better off.
As an extreme example, suppose aliens from another planet stopped by to say hello, and gave every American a free car as a gesture of interstellar friendship. Assuming that the cars are not in fact booby-trapped in order to wipe us out and take control of our precious supply of jelly beans, we would be fools to turn them down. Free cars are the best. But cheap cars are pretty good, too.