During war also. Unless you were under the assumption there weren't killings and shit outside of war during medieval times or something.

there are modern countries in the world today where children are not regularly shot to death in school.

I'm not ignoring it at all. You just hadn't added that caveat before. You were just talking about people using weapons to kill their kids which did regularly did happen swords and crossbows. It's not like people have changed for the better.