Argumentum ad Ruinam

I put a bit of dog Latin in this post, suggesting we should add to the list of logical fallacies "argumentum ad collapsium," to counter those people who claim that whatever we happen to be doing is fatally wrong, because all empires or great powers of the past have fallen.

I asked Dr Weevil to supply the right phrase, and he was kind enough to respond...

'Collapsium' is not good Latin. You want 'Argumentum ad Ruinam'. Latin 'ruina' is more specific than English 'ruin' and means basically 'collapse, falling down'. Hope this helps.