I understand what you're saying. Mind you, I'm not suggesting that you should ban the phrase “bearing false witness” when applied to posters. I'm all in favor of calling liars liars.
It's just that “bearing false witness” so clearly means at least “lying” that if the rules are to be consistent, it seems to me that you will need to ban the phrase.
sitetest
If a person testifies that he saw water in the desert, his testimony may be false (a mirage) but also not a lie, he did not intend to deceive.
Or more to the point around here:
Poster B: That's a lie.
Poster B: That's a lie.
It's a moderating nightmare because nuancing would allow that a post cannot be judged on its own merit, i.e. "That's a lie."
It is much more direct to simply disallow (or allow) the word "lie" and the phrase "bearing false witness" to be applied to another Freeper altogether.
Then again, under the nuancing, the magic phrase "I believe" innoculates anything else the poster says. For instance,
On the plus side of nuancing, the phrase "I believe" takes a lot of the heat out of the exchange.
If a poster says "I believe God is a rubber duck" then there is little cause for offense - humor, yes but offense, no.