No one should learn that it is good to kill people. The more realistic that toy guns are, the more likely boys are to be playing with toys that look like they could kill another human being. Then, too many children play with real guns, acting as though they are toys. Then, kids become statistics. Politicians call for gun control.
People kill people.
Then, they can sleep at night. It gets worse. I suspect this is what happened in Arkansas, where the boys took the guns from the home. Boys are taught at an early age, that guns are wonderful. Their elders teach them how to shoot.