Since you state that "the evidence shows", then please show the evidence that Canon has gone to court (or tried to) in China and got ignored or refused.
LEGO (the toy building brick company) have successfully taken Chinese copycats to court and won. First time was around 15 years ago. Note that I didn't say that China has become 'perfect', has become a 'rechtsstaat' or that it treats foreign and domestic companies equally. I'm only saying that China has gotten 'better' over the last 10-15 years. (there's possibly an argument somewhere for the statement that they couldn't any get worse).
A lot of people claim things like "China does X" or "China is Y" when they have in fact never set foot there, haven't worked there, haven't spoken with the people, don't speak the language, and don't understand the culture. That includes some fairly well-known journalists and self-proclaimed 'China experts' in the US and in Europe.
I'm not an 'expert' on China in any way, but I have lived and worked there for 2½ years and can speak/read and write a bit. That probably puts me ahead of 90-95% of everyone else.