Why was the kid in the house? Israel roof knocks every building it targets.
As for the other kid, I dont know the situation so I cant make an educated response. What I can say is I served in the army, and our open fire orders as very strict. Every shot needs to be authorised by a unit commander, and a shoot to kill order is only authorised when credible threats are in place. I know that because I lived by those orders, and I can assure you I never shot anybody.
Then your unit commanders are doing a lousy job.