I saw it as more of a warning about the limits of maps - when something happens that you think is impossible, then it is time to update your map, and not rail against the territory for failing to match it.
(Of course, it is possible that you have been fooled, somehow, into thinking that something has happened which has, in actual fact, not happened. This possibility should be considered and appropriately weighted (given whatever evidence you have of the thing actually happening) against the possibility that the map is simply wrong.)
If you've been fooled, there's still no point to calling it impossible, given that you're trying to find out what actually happened.
Another month, another rationality quotes thread. The rules are: