I think it has to do with the mindset instilled in our upbringing since young. And in some cases, the government and culture may not be too supportive of demonstrations (even peaceful ones)..for instance, in Singapore, there could be quite a bit of red tape to go through before you can hold a demonstrations, even a peaceful one..

Not all Asians have this workaholic sort of culture though..I was referring more to Japan, Korea, China, Hong Kong, etc.