...so, I didn't see your post until now.
Extradition to China is 1000 times worse than deportation to Mexico. So, I would think that most Americans would be on the side of the Hong Kong protestors.
Sure, things are bad in China for the inlanders, but your point below about realpolitic vs. idealpolitik is the key here. Voicing an opinion can make matters worse for them, depending on who does it and how it is done.