meta has always been a rather unregulated place. Do your best to cope, and feel free to let me know by email if you think something needs immediate attention! Our thinking is more or less that diverting trolls from the main site to meta is a success. (People over here have thicker skin, and understand more about the workings of mathoverflow, than they necessarily do on the main site, so little damage is done.)
In the same direction, when we suspend or ban people from the main site, it's important that they have some mechanism for appeal, and hence I'm rather hesitant to make bans on meta.
]]>(Ha! Asaf's suggestion works.)
]]>