So if the CIA and all US assets are out in full force treating this like an attack and trying to catch the responsible parties. Maybe it’s better not to yell out to the world that it was a terrorist attack. Why show our hands? Why not find out as much info as possible and make it seem like nothing will be done, then drop the hammer in a covert way. The purpose of a terrorist attack is publicity. Screaming terrorism to the world is what they want.
Your suggestion sounds like what I suspect was the thinking the night of the TWA 800 disaster.