Look how the director of HRW qualifies the US bombings of Syrian civilians

" Kenneth Roth (@KenRoth)

5/2/15, 12:57 PM
US reportedly kills 52 Syrian civilians in Birmahle. ISIS was 2 km away. What went wrong? trib.al/e5RPUxG pic.twitter.com/XzANTzdljy
What went wrong? He is implying that this kind of US bombing of civilians never ever happens.