> Thanks for the anecdote.

They're only sharing an annecdote because they are responding to your annecdote about not seeing a ceiling collapse.

> I don't think it changes the point of the metaphor.

If their anecdotes is moot, than your anecdote is also moot; if the anecdotes can only confirm a conclusion and never disconfirm, then we've created an unfalsifiable construction with the conclusion baked into it's premises.