Wonkette says it well.

Maybe, despite Roof’s confession, his real motivation was about a war on Christians. Or because there’s so much abortion in our country that he doesn’t know it’s wrong to slaughter nine people in a church, who just happen to be black. Perhaps we’ll never know the real reason, despite Roof saying what the real reason is. The last thing we’d want to do is jump to conclusions to make a racist hate crime about race, even when the confessed murderer is telling us that’s exactly what it is.

wonkette.com

And that right there - in a nicely satirical package - is the RW talking points.