Taiwan is part of China, will be unified with Mainland China sooner or later. You can try to separate yourself from Mainland Chinese people, but in the west, you will be treated the same as them by your FACE! Taiwan is only a tiny place in the world; nobody knows, but China is a superpower everybody knows. You can only have dignity when Taiwan is unified with Mainland.
I believe they just want to find a better place to live; nothing to do with politics. However, they do not know hardship is waiting for them. The American dream in their heart will be far away from their life.
I guess most of them do not know what is going on in the US. They think they may change their class in the US someday. Common sense is if they cannot survive well in China which is why they want to go to the states, it is even harder for them to stay here in the US.