Well coming in addition to what the real and full circumstances that makes "aggressive" an exaggeration.. more points to consider.
The KMT apparently had some major recruitment issues for the war against Japan:
This was a deadly affair in which men were kidnapped for the army, rounded up indiscriminately by press-gangs or army units among those on the roads or in the towns and villages, or otherwise gathered together. Many men, some the very young and old, were killed resisting or trying to escape. Once collected, they would be roped or chained together and marched, with little food or water, long distances to camp. They often died or were killed along the way, sometimes less than 50 percent reaching camp alive. Then recruit camp was no better, with hospitals resembling Nazi concentration camps like Buchenwald.
https://en.wikipedia.org/wiki/National_Revolutionary_Army
With that then a question arises? How could it be that recruitment was so difficult for the war against Japan if Japan was really so much at fault and so much in brutality. Sure brutality was carried out by the Japanese but was it really as
widespread as typical MSM articles make it appear? Consider that in 1937 that the rival of Chiang Kai-shek, switched sides to the Japanese. This wasn't just some grunt or low ranking officer. It was Wang Jingwei who was probably the only person closer to Sun Yat-sen than Chinag Kai-shek. And he switched over to the Japanese. The Japanese gave him the top position of the newly formed Chinese government in Japanese controlled areas. If the Japanese were so bad, why would they grant him a full administration? He was permitted to have his on forces even. He did so for China's sake, not Japan's. Who are we to say that, suppose the war ended with collapse of the KMT and/or it's NRA, would Wang Jingwei really have been worse than Chinag Kai-shek or Mao Zedong? How intense would Japanese administration be over the Wang regime? Well a separate national status was given to Manchuria and was aimed as a mixed race nation, hence the different colors on its flag. Or how was Korea or Taiwan during colonial years of Japan? The GDP per capita of both those places was roughly half that of the main Japanese islands, In comparison to the colonies of other empires, that's actually a rather high ratio. Populations of both doubled or so as well. And while GDP per capita increased, the populations essentially doubled in both those places as well. Of course by saying so is not so much a statement of saying that both should still be part of an empire of Japan. Rather I could say that a free Korea could be said to be a good result from the destruction of Imperial Japan (although Korea getting cut in half with the north being crazy DPRK and the south taking 3 to surpass years when part of Imperial Japan.. hard to call that good result). Although I think even today it is a little regrettable that the US decided to force Taiwan out of Japan as part of unconditional term. At any rate, the nightmare of purges and "re-education" in 1950s communist China and its "great leaps" and "cultural revolution" would be difficult to see as better than Imperial Japan. And the suppression and forced cultural changes in Tibet and Xinjiang don't really look like better examples than Imperial Japan colonies of Korea or Taiwan.