I have to say this - just the history of shoddy handling of chemicals by the Chinese is enough to make me think it could be another case of that.

The Sydney basin ie the land surrounding the city is called it's market garden.  It is many years now that the farms are mainly owned by Chinese and someone went round and made a film of their farming practices - there was footage of them mixing up chemicals willy nilly for the growing of veg - using things that are banned here.  and their storage of the dangerous chemicals was so not good either.

And this is what happened to me - one hot evening in middle of a busy Summer I saw one of those new frozen dinners in the supermarket, it was a box of spring rolls, just put in the oven, made in China.  During the night I got up feeling unwell and collapsed, into hospital with anaphylactic shock, and that has been a major ongoing problem for me ever since.  How could eating a spring roll create such havoc in my previously solid constitution.  

So yes plenty of personal reason to believe them responsible for making the mess but we all know that with some people if they are blaming the Chinese for the pandemic they're likely to cause a lot of harassment and suffering for the Chinese people who live amongst us.