Mencius warns against slaying others’ kin. Killing someone’s father or brother triggers retaliation against your own family. Though you do not kill your relatives personally, the tragic outcome barely differs from direct murder.
Mencius condemns boasting military skill as a great sin. A benevolent ruler wins universal longing without fierce battles. A punitive campaign means rectifying tyranny; people welcome such righteous forces, so brutal warfare is unnecessary.
Mencius claims no truly just wars occurred in the Spring and Autumn age, though some rulers acted less brutally. Only the Son of Heaven held the right to launch punitive campaigns; equal states had no authority to attack one another.
Mencius condemns King Hui of Liang as cruel. Benevolent rulers spread love outward, yet this king sacrificed common folk for land wars, then forced his beloved kin to die in battles, letting cruelty toward strangers ruin his own loved ones.