Some have, yes, used the flag for that purpose, though to the extent you suggest, I'm not really sure. Was there a CBF from every flagpole everywhere throughout the South to intimidate blacks? I don't believe so.
No, it went up in 1961, as I understand it for the centennial.
If your presumption is true, that could be a purpose, yes.
After a hateful senseless shooting, because the killer had photos taken with Confederate flags, the focus was turned from the hard business of dealing with hatred and violence to attacking an inanimate object which had nothing whatsoever to do with the crime. You are though perfectly entitled to your opinion regardless of whether I consider it to be erroneous.
Oh, I wasn't surprised. The first photo I saw of his car, I knew that the flag would be attacked even though it had nothing whatsoever to do with the crime.
On that we can agree.