Always a good start, try and educate and assist. As has been clearly demonstrated, some folks are simply beyond help. Doesn't mean give up, but sometimes you just have to let them hit the bottom before they are ready to stop talking and start listening. We are seeing some hit bottom here, because folks are not buying into their hate anymore.
Unfortunately, they generally just change boards when folks catch on to them, and start with a new group. Or change screen names. The names are different, the delusional thinking is the same.
Dr. Bob