There are so many videos like that out there. The fact that two Reuters journalists were killed in the "collateral murder" video is notable, but unfortunately children and first responders being killed is not out of the ordinary.
Yesterday I posted a compilation of Apache gunships blowing up black and white silhouettes of people and massive expanses of land. I don't buy for a second that the US military or their contractors really know anything about the people they are killing, beyond the fact that they have identified with certain groups for reasons that could range from nationalism to just plain self-preservation and a salary. It is undebatable that most of the 1,000,000s of people who died in the Middle East in the last 15 years were not guilty of any crime, and even if they were the US consistently provided no proof before incinerating them extra-judicially.