A while ago, I started a thread on Blogcatalog about the musical value of "political" songs, expressed my understanding about how a song may convey different meanings by its different aspects of art form: while the lyrics can be political, the music part can be totally musical or artistic. This song "My Motherland" happens to be one of my favorite "red" songs. Despite of it's historical context, I personally think it is one of the most beautiful Chinese folk songs. The lyrics is mostly about the love to motherland (China), about a understandable patriotism. I don't see any any pro-communism and anti-America slogans. So the only reason that this song reminds Chinese people about Korean War simply is because it was used in the movie.
I might have to agree that it was not the best choice to play this song in White House but, it should not be such a big deal.
I heard radio NPR interviewing Lang Lang about his performance, he denied that he knew about the context of this song. However, when he was interviewed by Chinese news media, he expressed his "pride" of being able to play something that glorify the power of China in front of so many powerful politicians of many countries.
One thing worth to mention is, the name of this pianist "Lang", sounds exactly like "wolf" in Chinese. It happened that he was raised by a father who is as ambitious as "tigar mother", so his father was call as "wolf father" by many Chinese people. He possesses every idea the "tigar mother" does, except he is more physically powerful than that woman. In Lang Lang's biograph he remembered once he missed 2 hours of piano practice his father asked him either swallow a whole bottle of pill or, to jump from the window.
Lang Lang is now considered as a music prodigy and super famous pianist in China. His father of course is also very famous by his "superior" way of raising his "genius" son, though "it's a little too hard to understand" by normal people, as one of interviewer from a Chinese television mentioned. But because of Lang Lang's huge success, I personally believe many Chinese people would still prove his father's "hard work". And if this was true, I guess very soon more children will jump through window (or swallow pills) without their parents' pushing them.