It's tragic, of course, but sadly this kind of thing can happen in warfare and the like when you have to make a snap call in a brief window based on limited intel. Especially with drones. You get it right and everybody applauds the win. You get it wrong.....you're a monster. But if you don't make that call and maybe missed out on hitting a prime target (or targets) that will later commit other horrible monstrosities....well then that's no good either.
Don't envy the people making those calls that's for sure