I will backtrack a bit. I am exaggerating and being a bit flip. But there have been elements of some characterizing whites in the South as vile racists. JMO
Saying that there are some racists in South Carolina is not at all the same as "characterizing whites in the South as vile racists."
The way the whole line of discussion developed was that it was discovered that the shooter was racially motivated, and is a proud racist. Racism does not develop in a vacuum, nor is it natural. So the question is asked -- how did he come to accept these views? It has then been noted that there are a large number of hate groups per capita in South Carolina. Many who have lived there have also said that in their experience, there is no shortage of racists there. The flag is seen as a symbol of enduring racism by many, and it is embraced by many racists, so it has been mentioned as well.
But nowhere does any of this imply that "whites in the South are vile racists". Some are, but nobody is saying that everyone is.
And to suggest that people here think that some are 'secretly pleased' about the murders is, I think as eileenhawkeye put it, disturbing. I think that dismissing it as being 'a bit flip' is likewise disturbing.
JMO.