Michael Moore? Seriously?
The confederate flag flies at the site (on capital grounds) of a civil war memorial. Regardless of whether one agrees with it being there or not, the flag did not cause these killings. Mr. Roof did not one day stroll by the grounds of the memorial, happy and content being a loving, peaceful non-racist white man, look up at the flag and say to himself, damn, I gotta go kill me some black folks cause of that there flag.
So idiots like Moore and others who want to dredge up old issues to explain what happened need to shut the hell up and leave us alone. Maybe take a cue from the son of the one victim who has been prominently seen forgiving his mother's killer. Or maybe a cue from the many citizens of Charleston, white and black, loving on each other and condemning this act as an act of pure hatred against all of us, white and black. But no, doing that won't get you on the news.