When you bust down the door to a home, under orders to kill everything, and there is a woman and her 5 year old daughter and 6 month old son, which of these evil creatures do you kill first? The mother first, so she doesn't have to watch you kill her infant son and toddler? Or, do you try to make swift work of the wicked baby and child before turning your sword on the evil mother.
Do you say anything to them while they beg you to not kill them?
Do you do it with glee? Would yahweh have a problem with it if you felt shame or hesitance in killing the baby and little girl?