Publicity is magic.The lesson from Ukraine is that irresponsible propaganda has cost the lives of many Western mercenaries who thought war was "easy and fun like video game".I wouldn't say japanese intervention would be a given, it's a % and it will vary due to many different factors such as the strength of the PLA and US willigness to actually fight the PLA.
Japan has the same dangerous tendency,they propagate day in and day out how technologically advanced Japan is and that Made in China will only explode.Even their current best-selling manga is promoting how easily and easily Japan could defeat a Chinese aircraft carrier without even the help of the United States!
Even if it is daily news,Japanese netizens are showing extreme contempt for China.All the media are creating the illusion that "if only the U.S. would help us, then we could easily defeat China".
Unfortunately, Japanese politicians have consciously used this to advocate the expansion of the military while completely disregarding the national strength and even advocating the argument of acquiring nuclear weapons.
Judging from historical experience, Japan will also seize the opportunity to make dangerous gambles whenever it has a slight advantage.
The people are tired of the day-to-day, useless diplomatic protests,the radicals claim that they don't care about any official so-called "hardline" views except for the landing of the army.For this, I personally don't think Xi and the leadership is that afraid of military actions, but the decision of taking military action against Taiwan is really complex and at the core it has become a China - US issue and confrontation.
They think it's a waste of resources in a "pariah" that doesn't even have official international status,and it happens to be tricked by American scaremongering.
The extremely limited support of the Americans for Taiwan has shown their actual attitude.There is a fundamental difference between caution and timidity.