Today is Sept. 11 again. There is some argument spontaneously on a Chinese online forum. The topic is: should Chinese be happy about 911. One says: you can hate USA but you must have a nature of human being. Another says: what USA did resulted in 911, so they deserve it, and we can be happy about it. 

I think that there is a very simple way to get an answer. Whoever are happy about it, go to show it to Americans, not hide himself or herself among Chinese and show off their happiness about that tragedy to make other Chinese uncomfortable.