No mater what ideas the creator had, it have over the last 150 years become the symbol of the confederacy for most people.
(in the US and everywhere else where people might know anything about the confederacy)
An attempt at creating a state based on race based slavery, that is very hard to morally defend today.
And it is being used/misused by right wing **** groups Exactly as a symbol of ****.
Just google a photo from the Charlottesville rally. It is carried by a lot of participates... side by side with the swastika.
So it should come as no surprise that many people see it as a symbol of slavery, hate, racism and ****.
I wold like to read a factual account of the use of the flag. Both during the war and since.
Because the KKK did not always use it as we can see from this parade true Washington in 1925
So something obviously changed. But what?
My guess would be that back in the 1920ties the Klan saw the federal government as something positive. Or at least as something that allowed the South to blatantly violate the Constitution in a number of ways. And as such allow the segregation and discrimination that existed by law.
And with Members of Congress and at least one Supreme court justice that was also members of the Klan it had some political power.
But Post 1960ties, I would think this view have changed since the federal government did force desegregation, the right to vote for colored and so on.
And at the same time it failed to deal with the less legally based segregation and discrimination in the north. So it would make sense that the federal government is now seen rather negatively.
And this would make the use of the cbf rather logical.