The problem with a catch-all forum called "off-topic", is that it will, by its very nature, attract lots of off-topic chatter :-)
I realise that this sounds paradoxical, but the current thread about the hurricane strikes me as something that needs to be caught before it develops into a shouting match. The initial post was exactly the sort of thing that "off-topic" exists for. xantheman's post isn't. Fortunately, we've had very little of that really (frankly, we can generate enough bad feelings just arguing about copyright and grammar!) but I do think that some sort of additional notice may need to be attached to the "off-topic" forum, simply to alert people to the fact that postings that are deliberately raising specific non-game related issues are very likely to be deleted.
My suggestion for a rewording:
This forum is for discussion issues not directly related to games in general. However, this is not a political blog site - postings that would be better directed to a news or opinion site are likely to be removed.
(fwiw I slightly disagree with you, in that I think that there are things that should provoke flamewars even in boardgaming, but that so far debates haven't got truly out of hand :-)