I visit this section of the forum very rarely so I noticed this discussion only now. I also post very occasionally and therefore did not have opportunity to develop any kind of relationship with either party of this argument. I never had any dealings with any of the mods. I am saying this merely to demonstrate that my opinion is quite likely unbiased.
I also do not have any idea about the history of communication, bans and warnings between the mod and poster in question. I understand that the reason for perma ban was the post quoted in this thread. This is how I read it:
The post seems to carry two messages:
1. The poster wishes that the specific mod does not moderate his posts. He also hints that reason for this wish is some previous occurrence, on which he felt he wasn't treated fairly. Note that the poster does not demand not to be subject to moderation at all, he just asks not to be moderated by this specific mod.
This reminds me of a common feature of probably every developed judicial system, which gives the parties of the case right to argue prejudice of the judge and demand replacement. It is of course required that there are some grounds for this; however, it is sometimes sufficient if there is at least a doubt about the judge's impartiality in order to accept the demand and replace the judge. All of this in the interest of fairness and transparency of the eventual judgment. Given the frequency of interactions between members and mods on this forum, some level of bias could have very well been present.
2. In his second message, the poster reserves the right to seek justice (to the extent of his opinion) at the mod's supervisor. This also reminds me of a feature of every normal administrative proceeding: that you can appeal the decision to relevant institution of higher instance. Also at this forum, mods "render judgments" based on their interpreting of certain set of rules. As in real life, these judgments are not necessarily just at all times, and therefore some situations may require rectification by a third party, i.e. an appeal of some sort.
You will certainly agree that not even the worst criminal can be sentenced only for claiming prejudice of the judge, or for appealing court's decision. Yet, in this case this is what arguably happened. Therefore I voted No in the poll.
My ideal response to the post in question would be like this:
1. Moderator's supervisor considers grounds for the poster's demand and communicates findings or conclusions, if any, to the poster. It is very well imaginable that the mod is asked to refrain from moderating this member - this would not in my opinion hurt running of this forum in any way
2. The post is of course deleted - it does not belong to public
3. Irrespective of the decision on point 1., a temporary ban should probably be handed, but not for the content of the post, but more for its tone (as the same message could have been communicated in much more friendly way)
Of course this is not real life but internet forum. This place does not belong to the members. The management of the site and mods (via authority granted to them by the management) have right to decide, whether they want a particular member to stay being a member, or whether they want to end his/her membership. If they wanted this particular poster to retain his membership, they had other options of dealing with this issue. They however decided not to utilise them, but issue permanent ban, thus suggesting that they do not wish that this member continues on the forum. And this is their right, irrespective of any "justice" element involved.