This is an amazing picture and people obviously interpreted it in the most horrific manner.
The actual story is that the black guy, Ted Landsmark had already been knocked down by the white guy. The guy that looks like he is holding Landsmark by his arms is actually helping him up and defended him. The flag holder is not stabbing him, he is waving the flag back and forth.
Interesting that the photographer, Stanley Forman won a Pulitzer two years in a row. For this picture and for