The stubbornness of clever people is commonplace and their retention of a view that is confounding to common sense should not astound us. But it does.
Have a look at
and you will see what I mean. It exhibits the time travelling paradox whereby we eliminate one person to save the lives of many. Certainty applies to that scenario when we travel back in time to alter a present fact. From the present moment’s point of view looking to the prevention of multiple murders in the future only God could know that they were prevented because they never will happen or more correctly never shall have happened. Odd tense that. So now, having killed an innocent person, all we have is that death on our hands.