Good T's always try and stop the negative dialogue whenever it is a non sequitur.
IMO PC is not a place to rant saying things that are not true, that are judgmental and of personal opinion only if it attacks another person or group. Even if everything is said in the "I statement/format" what is said needs to be edited to prevent the negative discourse of the attack. If the member is unable to do that for him/herself, then that's what the Community Team Member is supposed to do.
PC IS a place where all who are broken can come and find some healing, but not at the expense of other's healing needs. I don't think any member wants to do that anyway, and will understand once showed the way.
(((hugs)))