Then just don't. But stop trying to socially engineer the board.
You are the ONLY one who gets wildly off on it.
Most others just try to engage if drawn in, and when they can't, just let him be.
Between the Pillars of Severity and Mercy is patience.
You ban, severity.
You release the ban, mercy.
Just let it be.
“Opinions are valueless as evidence without exploration of the underlying facts and rational showing the path from the facts to the opinion.”