They seem to be making a big deal about not releasing what the boy said to them before he was shot.
It would go to suicide by cop.
Yes, the only reason I can think of is if his remarks were quite personal in nature, as opposed to threats to LE, which would further vindicate their action.
It’s unfortunate, but there’s often no other way to handle these situations. And everyone is on notice that if you don’t drop the gun, LE will shoot to kill.