And? When and if the protesters burn the city down, these companies will be far more likely to move their operation to the mainland rather than lose their market share there. You think they will side with the thugs that's burning down their business?
As China has already decided to move ahead with the national security law, it is pretty clear that they are no longer concerned with western smear campaign. The West have already spent all their ammunition on the trade war and the coronavirus slandering, whatever they can do next is pretty much irrelevant.
More protests they throw, the more evidences will there be for the upcoming law to charge them with. You do know that some of these people are already fleeing the city?