What caused the Qin attacks on Confucianism

Confucianism during the Warring States Period was attempted to be instated as a state philosophy through the efforts of Mencius, proposing that through the governing of moral principles like benevolence and righteousness, the state would win popular support from one state and those neighboring, eliminating the need of a war altogether. Mencius had attempted to convince King Hui of Liang, although was unsuccessful since the king saw no advantage in the period of wars.