Here's a thread posted by a moderator fanning the flames of the "Morrissey said there wouldn't be any more UK dates and ZOMG he added another one so he's a LIAR" debate:
http://www.morrissey-solo.com/thread...d-by-Morrissey
And here's an example of the kind of crap that spawned that little attempt at a bigger argument:
Originally Posted by Maurice E
Would you believe it, Morrissey has deceived his fans again.
Any Scottish people conned into buying tickets for the Manchester date, the only UK date of 2012?
As for what to do, the original argument about the horror of another concert date added could have been ended quickly with a "he's human and why is an extra date a bad thing? act like adults or take your need to fight over nothing to the pigsty or this gets deleted" post, followed up by actual action if it continued.
As for the second, deleting it and either warning or firing the moderator for continuing a ridiculous argument wouldn't be outside the realm of civil behavior.