These are public, not just behind-the-scenes. You can search the internet for any with quotes around them and you get returned to FreeRepublic. FR is tainted by this.
Maybe this is an inside joke by a few people to undermine the credibility of a poster or FR, but it is wrong and leaves a lasting mark against FR.
I have managed and moderated professional forums with over half-a-million users and this type of garbage can hurt the posters and the organization. It is poisonous and if the site becomes associated with this type of language and ideas, it is difficult to undo.
They need to be removed. If people can't be trusted to enter legit keywords, that functionality needs to be turned off.
Here are a couple searches that result in FreeRepublic and John Robinson being directly associated with them. They taint both and everyone on FR and its reputation. Much of this is recent and some has been going on a long time. Here are some examples as seen from a Google Search. You can also open any post and see what has been added, more than a few are offensive and they show general disregard for FR and Freepers. Many are direct insults to fellow Freepers.