I think that is vastly glossing over that many of them realise the long run is going to be an increased authoritarian regime imposed on their lives and many of the freedoms they are used to disappearing.
My "glossing" was about the current protests bringing that "Ultimate Chinese Aim" to HK much faster than if there were no violent protests and China would take it's time instead.
Ultimately there is little hope of any other outcome for them short of leaving as they can't really win in the long run, China might retreat here and there along the way but they won't stop pushing towards their eventual goal - the only hope these protestors really have is that somehow the world is shocked into having to act to such an extent China is forced to be hands off for a very long time to come.
True, they're screwed TBH, but that last sentence of "the only hope these protestors really have is that somehow the world is shocked" is what I find really worrying, because that means that the Chinese Military will have rolled in, and I don't see how is that "hope" for the average HK'er who just wants to keep their head down and live a quiet life.