I'm not talking about Japanese homeland,China doesn't have the ability or viability of invading Japan,at least for now and some decades to come.
The concerned islands are legally owned by the Japanese gov who bought it to prevent a tokyo hyper rightwing gov from purchasing it,hence it's Japanese controlled,and by sending navy to contest that only portrays China like a lawless thug, the Chinese claim has no historical or current international legal basis anymore. Any Chinese contest over islands owned legally and historically by Japan ,leaves no room for Chinese to be seen as a fair agent in the SCS. Even if Japan didn't had rights legally or historically(which they do) China shouldn't have been so unempathetic in antagonizing a nation over irrelevant rocks,the geopolitical significance of Japan is way more important,if Japan was made an ally instead of an enemy,China would have no reason to bother who controls anything between China and Japan,
China basically donated vast swaths of lands so generously to Pakistan,Russia ,Afghanistan but willingly antagonistic to Japan over nationalistic politics for politicians' personal interest.
Either Chinese side is misguided in their claim due to heavy anti-Japanese ideology or they are willingly acting like this to stroke nationalism and capture islands using superior numbers,that's still very wrong and deserve condemnation as any self serving wrong policy by any other gov.
China may have deserved sympathy in the war against Japanese side,(though I personally don't think Chiang Kai sek's side deserve any sympathy.)but this isn't 1936,in 2021,China has no rights in antagonizing people and who were not even born back in 1936 for their ancestor's actions. It's like harassing kids of criminals who themselves have committed no crime on their own,under state sponsored anti japanese propaganda lens,Chinese seek to harras the very kids ,and in such situation the criminal isn't the kid.The situation is like this now.
China shouldn't be so insensitive and antagonistic to a nation which is so important and so powerful,China can be so generous to Pakistan ,why not try a bit toward Japan,the dividend would be way more greater in geopolitical terms.