When choosing the itinerary for a flight I recently booked, one option had a layover that seemed quite short. Even so, in considering that option, it seemed to me unlikely that the airline would offer an itinerary that included a layover so short that — barring delayed flights or other unforeseeable circumstances — it didn't allow for passengers to make it from one leg to the next.
However, there are many questions on this forum which ask if certain layover times being offered by certain airlines are long enough, which suggests that airlines do in fact offer itineraries that include layovers that don't allow for passengers to make their connecting flights.
There seems no reason a person would choose such an itinerary unless the person is unaware that the layover time is unrealistically short. For the airlines to be making offers that would only be chosen by unaware passengers seems deceptive. That said, it also doesn't seem likely (to me) that the airlines are that intentionally fraudulent.
So, why do airlines offer flight itineraries with unrealistically short layovers?
Even though the flights that make up an itinerary are independent of each other, if passengers can't make a connecting flight with a given itinerary, it seems wrong for the airlines to offer it.