They are acting without any concern for the outside world - not for how they are perceived, not for any consequences. They are acting with pure self-determination. This works because they know they can be self sufficient and have a long term plan to get there.
Controlling the information/narrative domestically is the only variable they need to manipulate that matters. So as an outsider, it all seems quite inexplicable, but if you see it as a way to achieve long term political and infrastructure goals while maintaining social harmony locally - most of their actions make sense, even if they may not be morally justifiable to some/many/all people in some/many/all situations :)
Of course, all this allows the media to disclaim the party’s responsibility for basically everything.
Also, yeah; they view China as a self-determined empire stretching back 5000 years. The Chinese generally view Americans as arrogant children and not that smart. I suggest any white person who doesn’t understand racism go to China — they don’t give a fuck that you’re white and in many places will actively disdain you. If you tried to date a Chinese woman outside the large coastal cities you’d likely be literally run out of town. They are reaching the point where they don’t really need us; their own internal consumption is overtaking their exports to the US.
Chernobyl is a great example of this with deadly consequences. COVID is far worse sadly.
I don't think we could have contained it within China if they had a best response it was already out - well maybe 99.99% chance a not that educated guess - but we could probably have given ourselves a good amount more time. And hard shut down borders quickly if we knew the true vast numbers & death rates in early Wuhan. Then put out the 'embers' locally.
Gives at least some countries a chance of keeping it under control within their borders. Though I don't have faith our (US) CDC would have been up to the task...