Serbs know that a Bosnian child that lives to be an adult is going to kill Serbs at every opportunity. Therefore they kill every Bosnian they can regardless of age. American Indians knew that concept well. They would annihilate every member of an enemy village except the babies. The babies would be raised as their own.
Civilized people view savagery as contemptible and uncivilized.
Americans, even in combat do not normally exhibit such levels of hate. Only recently have we seen such viciousness in our society. Christians in America are under assault. Our government has declared that we are a threat. Our government agents kill men women and children.