Agreed. As I've said countless times, FoS can be a bitch.
Not every single one of his posts can be characterised thusly.
Also, he posts in the main sub-forum too. IOW, "sole purpose" does not apply in this case.
Even if it did, I'd be reticent to take moderation action 'cause there'd be an implication, even if not-deserved, of right-wing bias.
No excuse... except for the fact that he's covered by FoS.
I reiterate:
It can be a bitch. It requires that all participating be prepared to endure pea-brained, unhinged and unreasonable stances.
Of course, it goes without saying that the ignore option is available for those who're not willing to "endure", so there's always that last-resort failsafe I s'pose.