Because the US has adopted a policy and practice of trading everyone else's lives for their own safety, because American blood must never be shed, even in pursuit of its own reckless, badly conceived, poorly executed schemes,
nine children die in the city of Ghazni
Nothing more honourable than abject cowardice prevents Americans from investigating their so-called "good intelligence" in person. They are fed lies about their enemies and swallow them whole, because that's the American way. Then they unleash their apocalyptic firepower from half a mile away on 9 children and kill them all in their own home.
The "incident" is being investigated, no doubt by the same people who committed it; they will find themselves innocent. They will not concede that they were gullible, stupid or trigger happy, and above all they will not concede that they are abject, pestilential cowards.
But that it what they are.