When I was a mod, it all depended on many factors and I've no doubt the same applies now.

Moderators have lives away from here and can't always be on hand when something kicks off, which is why it's always best to see who is online and if nobody for the forum is available, contact another staff member.

Sometimes, a word of warning is all it takes.  I've done such myself and not needed to lock the thread.  Again, the human factor comes into play and some mods may let a thread continue for longer than others.  It is always a judgement call, since the staff realize everyone here is human and try to act accordingly.  Keep in mind there may also be communication behind the scenes that isn't posted in the forum, and that can also have the desired effect.  It's not always about threats, warnings or bans, either; sometimes, a simple appeal to reason makes all the difference.

I can't say I care much for your option 2 because it's open to abuse.  I know for a damn fact I'd abuse it, even though I believe myself to be a basically fair and reasonable person.  Still, it's an interesting point.  :) 

Coppula eam se non posit acceptera jocularum.

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