Robert,
I don't believe that Jimbo (or the Arbitration Committee) would ever
give any single Wikipedian "the authority to ban". If you find access to
Wikipedia blocked, please e-mail me privately, and I'll simply un-block
you.
(And if that results in me getting de-bureaucrated, de-sysopped, or even
banned myself -- so be it.)
Every mediation I've been involved in, has been successful. And as a
member advocate, everyone who agreed to follow my advice has managed to
avoid being banned. So if you want my help, you are welcome to it.
Ed Poor