"They're doing it because they are scared." "They're doing it out of desperation." That's called copium. It only makes you feel comfortable and justifies your inaction. Instead of feeling good thinking they are scared, you should think how much harm the scared people do to you.
Doing nothing is even more not always the answer. China did slap retaliatory tariffs on U.S. goods. China went tit-for-tat with the Australians and Canadians with import bans and also Micron.
It does not even mean a no counter move is required. You're applying standards like "always", "required" only to actions, never to inactions.
You're confusing the cause and result. Losing is the cause, whining is the result. The people who are losing are the people who are whining. Not whining even when you are losing doesn't make you not lose. Removing the result doesn't make the cause disappear. China has been patient for the last one year and South Koreans are only escalating confrontationism.
Not sure what you are even talking about, or the point.
If your point is China is being stupid, then you are wrong.
The objective fact is that trade is a record levels. Chinese companies making more money than ever. That includes record sales/exports to the Americans. Not sure what the problem is.
The point is to make money.
As for the other points you raised, regarding the trade war, China only slapped on some tariffs but not up to the same amount that the Americans did against Chinese goods, and China did not compensate by targeting other American interests at that time. If the Americans did 100 tat with the tariffs, China only did maybe 40-30 tit with the tariffs. Then saw trade expand to record levels.
As for the Italian tire maker, well, what difference does it make? The Chinese have a minority stake in that Italian company. For some reason, the Italian politicians got their panties in a knot. Bottom line, I don't think the Italians should be asking any favours from the Chinese anytime soon. You got to give something to get something. If they do not want to play, then they do not want to play. That is odd that the Italians don't want to play. Their economy is at the same level as 2008.
As for the Koreans, a quick summary of the past 30 years, since China and South Korea established diplomatic relations. There were ups and downs, and real cold periods, then they got back to talking again and things were smoother. This I not even talking South Korea, last 30 years North Korea and China relations been pretty volatile. In the end, does not seem much has change. As we see today, South Koreans no different than the North Koreans. That is not surprising because they are all Koreans. Be patient is the best policy for China with Korea.