As someone who is in the high risk group should this/when this is in the area, I am feeling kind of numb about it.
Even if you think it's not in your area it won't hurt to stay on top of awareness both of others as they are around you. Stay clean, avoid clouds of coughs.
Note, despite all these precautions I still managed to catch a common cold from my daughter. Thankfully it's mostly sinuses but impacts me otherwise. Just shows that everyone needs to be onboard with being diligent about staying clear of the stuff out there, not just ourselves.
I'm assuming those are the voices of young, not very many by the sounds of it. It's hard to tell with the buildings amplifying the sounds and dampening others coming from around corners. Still, I'd expect a protest to be more of a constant roar or chant. Perhaps not so much of a protest as it is an attempt to vocalize anguish. (But by China's laws it could be considered illegal to be so vocal.)
It's very understandable that they'd be upset with the situation.