"but what if he made no decision to operate just because he "didn't know". "

Grose, are you trying to play word games here? Just to win a debate? I have no clue what point you are trying to make - "That is exactly the type of reasoning I am saying is responsible. " ????

Making "no decision" is making a decision. He either has an operation or he doesn't. You can't be a little bit pregnant either.

Doctors make their recommendations based on the data that they have available. The doctor in Spaw's case made a decision. It is not a "leap of faith".