1. What if the law that's being opposed is legitimate? Should someone that commits murder in Taiwan be able to escape the law in HK?
2. All the accounts are created through VPNs. Well, YT is blocked in China. If Chinese people are trying to show us what the protesters are actually like (I don't know for real either way) they would have to use a VPN. And they would be inclined to work together to vote up related content for awareness.
3. If a state like let's say Texas in the US had a legal system where I could commit a crime in PA and escape to Texas, wouldn't we want to fix that? Of course there would be protests. Think of the recent protests we've had in France, just for tax reasons. You think if this kind of law changed in Texas you wouldn't see fires and overturned cars?
My point is, maybe our view into that side of the world is not as clear as we think.