They go by the name 50 Cent party:
https://en.wikipedia.org/wiki/50_Cent_PartyThis is purely something that's pushing a political agenda. In China, there's a single party, so disagreement is perceived as sabotage. While in other countries, its accepted as part of the system.
In US we have a house/senate minority leader: https://en.wikipedia.org/wiki/Minority_leader
In Westminster-based systems (Australia, Canada, UK), they call them opposition: https://en.wikipedia.org/wiki/Parliamentary_opposition
So if China lacks this representation, what is there to counterbalance? Wouldn't it lead to viewpoint discrimination?
There are things that need a more direct form a democracy to fix. Rent control, tighter restrictions on who does business/runs for election there. For instance, should agents of Beijing be fit to represent the people of HK and craft laws?
If you'd like to see what happens when foreign governments sabotage legislature, Poland's first legislative councils were rampant with it: https://en.wikipedia.org/wiki/History_of_Poland_in_the_Early...
What other outlet is there but giving control to HK citizens have total and complete sovereignty to handle their own localized issues?