They can sleep soundly knowing little boys and girls are dead because they followed procedures.
It's a real good idea to wait for the investigation. Generally speaking police officers are not going to shoot a kid without warning. In this case all the shots he got off using an Ar 15 in seconds doesn't allow wiggle room....tough call for any officer leading this charge...on backup etc. But they do have a responsibility for protecting their officers as well. Even is war our soldiers have to follow procedures and work as a team 'under fore'.
Proving what General Douglas MacArthur once said, “You’re not remembered for the rules you keep but the one’s you break’’.