Meng Chao understood what Ye Xiaoxing was trying to imply.
In the memories of his previous life, the Survival Committee had said that they ended the Monster War with a Pyrrhic victory. The monsters had been continuously evolving during the war, and they came to possess intelligence that was greater and even more mysterious than that of humans. Hence, they could infiltrate human society and assassinate important people, throw the city's order into chaos, and break their tactical facilities.
The monsters in the wild even came to possess strict organizations and gradually started developing a monster civilization.
In his previous life, Meng Chao was just a normal human during the Monster War, so he believed those words when he heard them.
After he accepted the harsh training in Ghost Tribe and became a third-class fighter, the Monster War had long since ended, so there was no need for him to be conflicted about it.