Very true Pokey, speculation is rife especially amongst the haters who make it all fit so nicely with their agenda. There could be many reasons for the cancellation, which you quite rightly point out, 'we have no idea about'.
I think, on the night, security messed up, big time, so maybe Moz is reviewing security arrangements.
I've read Moz bans bags being brought into the venue for security reasons, which, these days, I think is absolutely the right thing to do, so how someone with a placard, or 2, actually got into the venue is beyond me.
The result of this security failure is there for everyone to see & someone's arse will be in a sling because of it, & well deserved too.
Does Moz have his own security which travel with him, or does he rely on event provided security?